Whitney Houston was the golden girl of the music industry

Whitney Houston, who died Saturday, wowed audiences with effortless, powerful, and peerless vocals rooted in the black church but made palatable to the masses with a pop sheen.

Whitney Houston, who ruled as pop music's queen until her majestic voice was ravaged by drug use and her regal image was tarnished by erratic behavior and a tumultuous marriage to singer Bobby Brown, has died on the eve of the Grammy Awards she once reigned.

Beverly Hills police Lt. Mark Rosen said Houston was pronounced dead Saturday afternoon in her room on the fourth floor of the Beverly Hilton. "There were no obvious signs of any criminal intent," Rosen said.

Houston's publicist, Kristen Foster, said the cause of death was unknown.

Houston's death came on the night before music's biggest showcase, the Grammys. She will be remembered Sunday in a tribute by Jennifer Hudson, organizers said.

IN PICTURES: Grammy nominees 2012

Two days ago, she performed at a pre-Grammy party with singer Kelly Price. Singer Kenny Lattimore hosted the event, and said Houston sang the gospel classic "Jesus Loves Me" with Price, her voice registering softly, not with the same power it had at its height.

Lattimore said Houston was gregarious and was in a good mood, surrounded by friends and family, including daughter Bobbi Kristina.

"She just seemed like she was having a great night that night," said Lattimore, who said he was in shock over her death.

Aretha Franklin, her godmother, also said she was stunned.

"I just can't talk about it now," Franklin said in a short statement. "It's so stunning and unbelievable. I couldn't believe what I was reading coming across the TV screen."

The Rev. Al Sharpton said he would call for a national prayer Sunday morning during a service at Second Baptist Church in Los Angeles.

"The morning of the Grammys, the world should pause and pray for the memory of a gifted songbird," Sharpton said in a statement.

In a statement, Recording Academy President and CEO Neil Portnow said Houston "was one of the world's greatest pop singers of all time who leaves behind a robust musical soundtrack spanning the past three decades."

At her peak, Houston was the golden girl of the music industry. From the mid-1980s to the late 1990s, she was one of the world's best-selling artists. She wowed audiences with effortless, powerful and peerless vocals rooted in the black church but made palatable to the masses with a pop sheen.

Her success carried her beyond music to movies, where she starred in hits like "The Bodyguard" and "Waiting to Exhale."

She had the perfect voice and the perfect image: a gorgeous singer who had sex appeal but was never overtly sexual, who maintained perfect poise.

She influenced a generation of younger singers, from Christina Aguilera to Mariah Carey, who when she first came out sounded so much like Houston that many thought it was Houston.

But by the end of her career, Houston became a stunning cautionary tale of the toll of drug use. Her album sales plummeted and the hits stopped coming; her once serene image was shattered by a wild demeanor and bizarre public appearances. She confessed to abusing cocaine, marijuana and pills, and her once pristine voice became raspy and hoarse, unable to hit the high notes as she had during her prime.

"The biggest devil is me. I'm either my best friend or my worst enemy," Houston told ABC's Diane Sawyer in an infamous 2002 interview.

It was a tragic fall for a superstar who was one of the top-selling artists in pop music history, with more than 55 million records sold in the United States alone.

She seemed to be born into greatness. In addition to being Franklin's goddaughter, she was the daughter of gospel singer Cissy Houston and the cousin of 1960s pop diva Dionne Warwick.

Houston first started singing in the church as a child. In her teens, she sang backup for Chaka Khan, Jermaine Jackson and others, in addition to modeling. It was around that time when music mogul Clive Davis first heard Houston perform.

"The time that I first saw her singing in her mother's act in a club ... it was such a stunning impact," Davis told "Good Morning America."

"To hear this young girl breathe such fire into this song. I mean, it really sent the proverbial tingles up my spine," he added.

Before long, the rest of the country would feel it, too. Houston made her album debut in 1985 with "Whitney Houston," which sold millions and spawned hit after hit. "Saving All My Love for You" brought her her first Grammy, for best female pop vocal. "How Will I Know," ''You Give Good Love" and "The Greatest Love of All" also became hit singles.

Another multiplatinum album, "Whitney," came out in 1987 and included hits like "Where Do Broken Hearts Go" and "I Wanna Dance With Somebody."

The New York Times wrote that Houston "possesses one of her generation's most powerful gospel-trained voices, but she eschews many of the churchier mannerisms of her forerunners. She uses ornamental gospel phrasing only sparingly, and instead of projecting an earthy, tearful vulnerability, communicates cool self-assurance and strength, building pop ballads to majestic, sustained peaks of intensity."

Houston was to make her return to film in the remake of the classic movie "Sparkle." Filming on the movie, which stars former "American Idol" winner Jordin Sparks, recently wrapped.

Simon Cowell told CNN's Piers Morgan on Saturday night that he had been considering Houston as a possible judge on the U.S. version of his talent competition, "The X Factor."

"She would have been the ultimate, ultimate mentor to any contestant coming on the show," Cowell said.

Associated Press writers Andrew Dalton in Los Angeles and Adrian Sainz in Memphis, Tenn., contributed to this report.

IN PICTURES: Grammy nominees 2012