Singer Natalie Cole is memorialized at the 47th NAACP Image Awards in Pasadena, California February 5, 2016. REUTERS/Mario Anzuoni

Robbie Yancy greets mourners after a funeral service for his mother singer Natalie Cole in Los Angeles, California January 11, 2016. Cole, whose biggest hit came in a virtual duet with her late father, pop legend Nat King Cole, of his decades-old hit "Unforgettable, died December 31, 2015. REUTERS/Kevork Djansezian

Casey Cole (C) greets mourners after a funeral service for her sister and singer Natalie Cole in Los Angeles, California, January 11, 2016. Cole, whose biggest hit came in a virtual duet with her late father, pop legend Nat King Cole, of his decades-old hit "Unforgettable, died December 31, 2015. REUTERS/Kevork Djansezian

Freddy Cole, brother of Nat King Cole, waits in a limousine after a funeral service for singer Natalie Cole in Los Angeles, California, January 11, 2016. Cole, whose biggest hit came in a virtual duet with her late father, pop legend Nat King Cole, of his decades-old hit "Unforgettable, died December 31, 2015. REUTERS/Kevork Djansezian

Lionel Richie departs after a funeral service for singer Natalie Cole in Los Angeles, California, January 11, 2016. Cole, whose biggest hit came in a virtual duet with her late father, pop legend Nat King Cole, of his decades-old hit "Unforgettable, died December 31, 2015. REUTERS/Kevork Djansezian

Casey Cole is comforted after a funeral service for her sister and singer Natalie Cole in Los Angeles, California, January 11, 2016. Cole, whose biggest hit came in a virtual duet with her late father, pop legend Nat King Cole, of his decades-old hit "Unforgettable, died December 31, 2015. REUTERS/Kevork Djansezian

Record producer David Foster departs after a funeral service for singer Natalie Cole in Los Angeles, California, January 11, 2016. Cole, whose biggest hit came in a virtual duet with her late father, pop legend Nat King Cole, of his decades-old hit "Unforgettable, died December 31, 2015. REUTERS/Kevork Djansezian

Lionel Richie (R) and Jesse Jackson attend a funeral service for singer Natalie Cole in Los Angeles, California, January 11, 2016. Cole, whose biggest hit came in a virtual duet with her late father, pop legend Nat King Cole, of his decades-old hit "Unforgettable, died December 31, 2015. REUTERS/Kevork Djansezian

Pallbearers push the coffin of singer Natalie Cole after a funeral service in Los Angeles, California, January 11, 2016. Cole, whose biggest hit came in a virtual duet with her late father, pop legend Nat King Cole, of his decades-old hit "Unforgettable, died December 31, 2015. REUTERS/Kevork Djansezian TPX IMAGES OF THE DAY

Stevie Wonder (2nd R) arrives for a funeral service for singer Natalie Cole in Los Angeles, California, January 11, 2016. Cole, whose biggest hit came in a virtual duet with her late father, pop legend Nat King Cole, of his decades-old hit "Unforgettable" died December 31, 2015. REUTERS/Kevork Djansezian

Stevie Wonder arrives for a funeral service for singer Natalie Cole in Los Angeles, California, January 11, 2016. Cole, whose biggest hit came in a virtual duet with her late father, pop legend Nat King Cole, of his decades-old hit "Unforgettable" died December 31, 2015. REUTERS/Kevork Djansezian

Stevie Wonder arrives for a funeral service for singer Natalie Cole in Los Angeles, California, January 11, 2016. Cole, whose biggest hit came in a virtual duet with her late father, pop legend Nat King Cole, of his decades-old hit "Unforgettable" died December 31, 2015. REUTERS/Kevork Djansezian

Record producer David Foster arrives for a funeral service for singer Natalie Cole in Los Angeles, California, January 11, 2016. Cole, whose biggest hit came in a virtual duet with her late father, pop legend Nat King Cole, of his decades-old hit "Unforgettable" died December 31, 2015. REUTERS/Kevork Djansezian

Lionel Richie (C) and Smokey Robinson (2nd R) arrive for a funeral service for singer Natalie Cole in Los Angeles, California, January 11, 2016. Cole, whose biggest hit came in a virtual duet with her late father, pop legend Nat King Cole, of his decades-old hit "Unforgettable" died December 31, 2015. REUTERS/Kevork Djansezian

Lionel Richie (L) and Smokey Robinson greet each other as they arrive for a funeral service for singer Natalie Cole in Los Angeles, California, January 11, 2016. Cole, whose biggest hit came in a virtual duet with her late father, pop legend Nat King Cole, of his decades-old hit "Unforgettable" died December 31, 2015. REUTERS/Kevork Djansezian

Smokey Robinson (L) hugs Lionel Richie as they arrive for a funeral service for singer Natalie Cole in Los Angeles, California, January 11, 2016. Cole, whose biggest hit came in a virtual duet with her late father, pop legend Nat King Cole, of his decades-old hit "Unforgettable" died December 31, 2015. REUTERS/Kevork Djansezian

Lionel Richie (L) hugs Smokey Robinson as they arrive for a funeral service for singer Natalie Cole in Los Angeles, California, January 11, 2016. Cole, whose biggest hit came in a virtual duet with her late father, pop legend Nat King Cole, of his decades-old hit "Unforgettable" died December 31, 2015. REUTERS/Kevork Djansezian

Smokey Robinson hugs Lionel Richie as they arrive for a funeral service for singer Natalie Cole in Los Angeles, California, January 11, 2016. Cole, whose biggest hit came in a virtual duet with her late father, pop legend Nat King Cole, of his decades-old hit "Unforgettable" died December 31, 2015. REUTERS/Kevork Djansezian

A person takes a photo of the star of late singer Natalie Cole on the Hollywood Walk of Fame in Los Angeles, California January 4, 2016. Grammy-winning singer Cole, whose biggest hit came in a virtual duet with her late father, pop legend Nat King Cole, of his decades-old hit "Unforgettable," has died at the age of 65, her family said on Friday. REUTERS/Mario Anzuoni

Flowers and candles adorn the star of late singer Natalie Cole on the Hollywood Walk of Fame in Los Angeles, California January 4, 2016. Grammy-winning singer Cole, whose biggest hit came in a virtual duet with her late father, pop legend Nat King Cole, of his decades-old hit "Unforgettable," has died at the age of 65, her family said on Friday. REUTERS/Mario Anzuoni

Flowers and candles adorn the star of late singer Natalie Cole on the Hollywood Walk of Fame in Los Angeles, California January 4, 2016. Grammy-winning singer Cole, whose biggest hit came in a virtual duet with her late father, pop legend Nat King Cole, of his decades-old hit "Unforgettable," has died at the age of 65, her family said on Friday. REUTERS/Mario Anzuoni TPX IMAGES OF THE DAY

Flowers and candles adorn the star of late singer Natalie Cole on the Hollywood Walk of Fame in Los Angeles, California January 4, 2016. Grammy-winning singer Cole, whose biggest hit came in a virtual duet with her late father, pop legend Nat King Cole, of his decades-old hit "Unforgettable," has died at the age of 65, her family said on Friday. REUTERS/Mario Anzuoni

Flowers and candles adorn the star of late singer Natalie Cole on the Hollywood Walk of Fame in Los Angeles, California January 4, 2016. Grammy-winning singer Cole, whose biggest hit came in a virtual duet with her late father, pop legend Nat King Cole, of his decades-old hit "Unforgettable," has died at the age of 65, her family said on Friday. REUTERS/Mario Anzuoni

Natalie Cole poses backstage during the 14th Latin Grammy Awards in Las Vegas, Nevada, in this file photo taken November 21, 2013. Cole, the daughter of legendary jazz singer Nat 'King' Cole, has died at the age of 65, according to news reports. REUTERS/Steve Marcus/Files

Singer Natalie Cole sings at "An Evening of SeriousFun Celebrating the Legacy of Paul Newman" event in New York March 2, 2015. REUTERS/Lucas Jackson (UNITED STATES - Tags: ENTERTAINMENT)

Music producer Berry Gordy and singer Natalie Cole pose at the 2014 Carousel of Hope Ball at the Beverly Hilton Hotel in Beverly Hills, California October 11, 2014. The event benefits the Barbara Davis Center for Childhood Diabetes. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT)

Musicians Steven Tyler and Natalie Cole greet each other at the 21st annual Race To Erase MS fundraiser in Los Angeles, California May 2, 2014. The acronym MS refers to the inflammatory disease multiple sclerosis. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT)

Singer Natalie Cole poses at the 21st annual Race To Erase MS fundraiser in Los Angeles, California May 2, 2014. The acronym MS refers to the inflammatory disease multiple sclerosis. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT)

Musicians Steven Tyler and Natalie Cole (R) pose with host Nancy Davis at the 21st annual Race To Erase MS fundraiser in Los Angeles, California May 2, 2014. The acronym MS refers to the inflammatory disease multiple sclerosis. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT HEALTH)

Musicians Steven Tyler and Natalie Cole (R) pose with host Nancy Davis at the 21st annual Race To Erase MS fundraiser in Los Angeles, California May 2, 2014. The acronym MS refers to the inflammatory disease multiple sclerosis. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT HEALTH)

Musicians Steven Tyler and Natalie Cole pose at the 21st annual Race To Erase MS fundraiser in Los Angeles, California May 2, 2014. The acronym MS refers to the inflammatory disease multiple sclerosis. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT HEALTH)

Singer Natalie Cole poses at the 21st annual Race To Erase MS fundraiser in Los Angeles, California May 2, 2014. The acronym MS refers to the inflammatory disease multiple sclerosis. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT HEALTH)

Natalie Cole poses backstage during the 14th Latin Grammy Awards in Las Vegas, Nevada November 21, 2013. REUTERS/Steve Marcus (UNITED STATES Tags: Entertainment) (GRAMMYS-BACKSTAGE)

Natalie Cole poses backstage during the 14th Latin Grammy Awards in Las Vegas, Nevada November 21, 2013. REUTERS/Steve Marcus (UNITED STATES Tags: Entertainment) (GRAMMYS-BACKSTAGE)

Natalie Cole poses backstage during the 14th Latin Grammy Awards in Las Vegas, Nevada November 21, 2013. REUTERS/Steve Marcus (UNITED STATES Tags: Entertainment) (GRAMMYS-BACKSTAGE)

Natalie Cole performs "Acercate Mas" during the 14th Latin Grammy Awards in Las Vegas, Nevada November 21, 2013. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT) (GRAMMYS-SHOW)

Natalie Cole performs "Acercate Mas" during the 14th Latin Grammy Awards in Las Vegas, Nevada November 21, 2013. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT) (GRAMMYS-SHOW)

Natalie Cole performs "Acercate Mas" during the 14th Latin Grammy Awards in Las Vegas, Nevada November 21, 2013. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT) (GRAMMYS-SHOW)

Singer Natalie Cole poses backstage during the 14th Latin Grammy Awards in Las Vegas, Nevada November 21, 2013. REUTERS/Steve Marcus (UNITED STATES Tags: Entertainment) (GRAMMYS-BACKSTAGE)

Singer Natalie Cole poses backstage during the 14th Latin Grammy Awards in Las Vegas, Nevada November 21, 2013. REUTERS/Steve Marcus (UNITED STATES Tags: Entertainment) (GRAMMYS-BACKSTAGE)

Musicians Smokey Robinson and Natalie Cole arrive for the 44th Annual Songwriters Hall of Fame ceremony in New York June 13, 2013. REUTERS/Carlo Allegri (UNITED STATES - Tags: ENTERTAINMENT)

Singer Natalie Cole arrives for the 44th Annual Songwriters Hall of Fame ceremony in New York, June 13, 2013. REUTERS/Carlo Allegri (UNITED STATES - Tags: ENTERTAINMENT)

Singer Natalie Cole arrives for the 44th Annual Songwriters Hall of Fame ceremony in New York, June 13, 2013. REUTERS/Carlo Allegri (UNITED STATES - Tags: ENTERTAINMENT)

Musicians Smokey Robinson and Natalie Cole (R) arrive for the 44th Annual Songwriters Hall of Fame ceremony in New York June 13, 2013. REUTERS/Carlo Allegri (UNITED STATES - Tags: ENTERTAINMENT)

Singer Natalie Cole speaks at the ceremony where songwriter and music producer David Foster was honored with a star on the Walk of Fame in Hollywood, California May 31, 2013. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT)

Singer Natalie Cole arrives at the 13th Latin Grammy Awards in Las Vegas, Nevada, November 15, 2012. REUTERS/Steve Marcus (UNITED STATES - Tags: ENTERTAINMENT)

Singer Natalie Cole arrives during the 13th Latin Grammy Awards in Las Vegas, Nevada November 15, 2012. REUTERS/Steve Marcus (UNITED STATES - Tags: ENTERTAINMENT)

Natalie Cole performs at the Latin Recording Academy Person of the Year concert and tribute dinner honoring Brazilian musician Caetano Veloso in Las Vegas, Nevada November 14, 2012. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT)

U.S. singer Natalie Cole performs at the Latin Recording Academy Person of the Year concert and tribute dinner honoring Brazilian musician Caetano Veloso in Las Vegas, Nevada November 14, 2012. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT)

Singer Natalie Cole arrives for the 2012 Latin Recording Academy Person of the Year tribute dinner and concert honoring Caetano Veloso at the MGM Grand Garden Arena in Las Vegas, Nevada November 14, 2012. REUTERS/Steve Marcus (UNITED STATES - Tags: ENTERTAINMENT)

U.S. singer Natalie Cole performs at the Latin Recording Academy Person of the Year concert and tribute dinner honoring Brazilian musician Caetano Veloso in Las Vegas, Nevada November 14, 2012. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT)

Singer Natalie Cole arrives for the 2012 Latin Recording Academy Person of the Year tribute dinner and concert honoring Caetano Veloso at the MGM Grand Garden Arena in Las Vegas, Nevada November 14 , 2012. REUTERS/Steve Marcus (UNITED STATES - Tags: ENTERTAINMENT)

Actress Holly Robinson Peete displays her purse, made from a Natalie Cole album, as she arrives at the 3rd annual ESSENCE Black Women in Music event in Los Angeles, California February 8, 2012. REUTERS/Fred Prouser (UNITED STATES - Tags: ENTERTAINMENT FASHION)

Singer Smokey Robinson (L), recipient of the 20th Ella Award at the Society of Singers annual dinner, looks on with friends Natalie Cole and Stevie Wonder, as they perform in his honor in Beverly Hills, California September 19, 2011. REUTERS/Fred Prouser (UNITED STATES - Tags: ENTERTAINMENT)

Singer Smokey Robinson (L) recipient of the 20th Ella Award at the Society of Singers annual dinner, sings along with friends Natalie Cole and Stevie Wonder as they perform in Robinson's honor in Beverly Hills, California September 19, 2011. REUTERS/Fred Prouser (UNITED STATES - Tags: ENTERTAINMENT)

Singer Smokey Robinson (L), recipient of the 20th Ella Award at the Society of Singers annual dinner, sings along with friends Natalie Cole and Stevie Wonder, as they perform in Robinson's honor in Beverly Hills, California September 19, 2011. REUTERS/Fred Prouser (UNITED STATES - Tags: ENTERTAINMENT)

Singer Smokey Robinson (L), recipient of the 20th Ella Award at the Society of Singers annual dinner, sings along with friends Natalie Cole and Stevie Wonder, as they perform in Robinson's honor in Beverly Hills, California September 19, 2011. REUTERS/Fred Prouser (UNITED STATES - Tags: ENTERTAINMENT)

Singer Natalie Cole performs at the Society of Singers annual dinner in Beverly Hills, California, September 19, 2011. REUTERS/Fred Prouser (UNITED STATES - Tags: ENTERTAINMENT)

Singer Natalie Cole performs at the Society of Singers annual dinner in Beverly Hills, California, September 19, 2011. REUTERS/Fred Prouser (UNITED STATES - Tags: ENTERTAINMENT)