Whitney Houston

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The duet of "Celebrate" from the movie "Sparkle" with Jordin Sparks (left) and Whitney Houston - Houston's final recording - will be available June 5 on iTunes. (Sony Pictures Entertainment via Associated Press)

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** FILE ** In this Feb. 12, 2011 file photo, singer Whitney Houston, left, and her daughter Bobbi Kristina arrive at the Pre-Grammy Gala & Salute to Industry Icons with Clive Davis honoring David Geffen in Beverly Hills, Calif. A reality show featuring Whitney Houston's relatives, including daughter Bobbi Kristina and mother Cissy, is in the works. Houston rep Kristen Foster confirmed the Lifetime show ìThe Houston Family Chroniclesî on Friday, May 11, 2012. Houston drowned in a bathtub in February at age 48, a death that was complicated by cocaine use. (AP Photo/Dan Steinberg, file)

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** FILE ** In this Oct. 28, 2006, file photo, musician Whitney Houston arrives at the 17th Carousel of Hope Ball benefiting the Barbara Davis Center for Childhood Diabetes in Beverly Hills, Calif. An autopsy report shows that cocaine was found in Houston's system and that investigators recovered white powdery substances from her hotel room. (AP Photo/Matt Sayles, file)

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** FILE ** In this April 25, 2010 file photo, singer Whitney Houston performs at the o2 in London as part of her European tour. An autopsy report shows that cocaine was found in Houston's system and that investigators recovered white powdery substances from her hotel room. Houston died Feb. 11, in California at the age of 48. (AP Photo/Joel Ryan, file)

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** FILE ** In this undated file image provided by Sony Pictures Entertainment, singer-actresses Jordin Sparks, left, and Whitney Houston are shown in a scene from the upcoming film "Sparkle." Viewers got a first glimpse of Houston's upcoming film Monday, April 2, 2012, when NBC's "Today" show premiered a trailer for the much-awaited release. (AP Photo/Sony Pictures, Alicia Gbur, File)

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"Back in the '80s and '90s, there wasn't a musical act I hadn't interviewed and many of them became friends," write Rusty Humphries. One of those performers was Whitney Houston. (Associated Press)

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** FILE ** This Jan. 17, 2009 file photo shows singer Whitney Houston at the BET Honors in the Warner Theatre in Washington. Coroner's officials said Thursday, March 22, 2012, that Houston drowned, but her Feb. 11 death was also caused by heart disease and cocaine use that suggested she was chronically using the drug. (AP Photo/Evan Agostini, File)

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Oprah Winfrey comforts Bobbi Kristina Brown, who recalls the strong bond and devastating death of her mother, singer Whitney Houston, in an interview that aired Sunday on the OWN network. (Harpo Inc. via Associated Press)

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The hearse carrying the body of singer Whitney Houston arrives at Fairview Cemetery in Westfield, N.J., for her burial on Sunday, Feb. 19, 2012. (AP Photo/Rich Schultz)

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A coffin holding the remains of singer Whitney Houston is carried into the New Hope Baptist Church before her funeral services in Newark, N.J., on Saturday, Feb. 18, 2012. (AP Photo/Jason DeCrow)

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Candles burn at a memorial at a memorial to Whitney Houston outside New Hope Baptist Church in Newark, N.J., early Saturday, Feb. 18, 2012. Whitney Houston's funeral will take place later Saturday at the church where she sang in the choir as a girl. (AP Photo/Mel Evans)

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**FILE** Singer Whitney Houston arrives Oct. 28, 2006, at the 17th Carousel of Hope Ball benefiting the Barbara Davis Center for Childhood Diabetes in Beverly Hills, Calif. (Associated Press)

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L.A. Assistant Chief Coroner Ed Winter says it is not unusual that Whitney Houston's medical providers have been subpoenaed to provide records on her. (Associated Press)

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Whitney Houston starred in the 1992 film "The Bodyguard," which featured Miss Houston's biggest hit, the Dolly Parton-penned "I Will Always Love You." (Warner Brothers)

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Whitney Houston fans gather outside Whigham Funeral Home in Newark, N.J. Miss Houston's funeral service is set for Saturday at Newark's New Hope Baptist Church, where Miss Houston sang. There will be no wake or public memorial. (Associated Press)

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The body of Whitney Houston arrives at the Whigham Funeral Home in Newark, N.J., on Monday, Feb. 13, 2012. (AP Photo/Rich Schultz)

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Jennifer Hudson performs "I Will Always Love You" during a tribute to the late Whitney Houston during the Grammy Awards show on Sunday. (Associated Press)

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Whitney Houston performs onstage at the 37th Annual American Music Awards in Los Angeles on Nov. 22, 2009. The cause of the singer's death on Saturday is under investigation. (Associated Press)

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Whitney Houston sings with her daughter, Bobbi Kristina Brown, during a performance on "Good Morning America" in Central Park in New York on Sept. 1, 2009. From the mid-1980s to the late 1990s, Miss Houston was one of the world's best-selling artists. (Associated Press)