British soul diva Adele made a triumphant return to the stage at the Grammys on Sunday, winning a clean sweep of six awards and a standing ovation, in a show clouded by the death of Whitney Houston.
The 23-year-old Londoner, who has been out of action since October in order to undergo throat surgery, wowed a star-studded audience with a storming rendition of her worldwide hit Rolling in the Deep.
The tune won best song Grammy, to add to Adele's haul of awards for best record, best album for her breakthrough 21, best short video, best pop album and best pop artist -- wins in all six categories in which she was nominated.
"This record is inspired by something that is really normal ... just a rubbish relationship," said Adele, adding: "It's been the most life-changing year."
"Oh, I got a bit of snot!" she said in her trademark cockney accent, wiping her nose and fighting back tears at the climax of the three-and-a-half hour show, which ended with a Beatles medley led by Paul McCartney.
The other hotly-anticipated comeback of the night was by iconic 1960s California surfer band the Beach Boys, who played together live on stage for the first time in over two decades.
A three-song tribute started with a close-harmony version of Surfer Girl by Maroon 5, and then the falsetto strains of Wouldn't It Be Nice by Foster the People, against a backdrop of multicoloured surf boards.
After a standing ovation, the Beach Boys themselves, all now in their 60s, then took to the stage to play Good Vibrations, with famously glum-looking Brian Wilson almost smiling as he hit the high notes with his old bandmates.
Another blast from the past came in the form of country legend Glen Campbell, currently on a farewell tour after being diagnosed with Alzheimer's, who had the audience singing along with his classic Rhinestone Cowboy.
But while Adele was the big winner, the show was punctuated with tributes to Houston, the 1980s and 1990s superstar who died on Saturday at age 48 at the Beverly Hilton hotel on the eve of the US music industry's big awards night.
The Grammy show began with a prayer for Houston from host LL Cool J.
"There is no way around this. We've had a death in our family," he said, adding: "The only thing that feels right is to begin with a prayer for a woman who we loved, for our fallen sister."
The audience, with stars including McCartney in the front row, then watched a clip of Houston singing one of her greatest hits, I Will Always Love You, and gave her a standing ovation.
"Whitney, we will always love you," said the US rapper host. "This night is about something truly universal and healing; this night is about music."
Later in the show, singer Jennifer Hudson -- who was presented with a Grammy by Houston in 2009 -- gripped the audience in silence with a classy rendition of I Will Always Love You, the smash hit from Houston's film The Bodyguard.
"Whitney, we love you," she said as she closed the performance sung to a piano accompaniment, spotlighted in the dark in a plain black dress.
Houston's family issued a statement before the show, saying: "We are devastated by the loss of our beloved Whitney. This is an unimaginable tragedy and we will miss her terribly."
The LA County coroner's office reiterated that there appeared to be no suspicious circumstances surrounding the death.
"At this time... there are no signs of foul play," Assistant Chief Coroner for Los Angeles County Ed Winter told reporters shortly before the Grammys show kicked off.
A further scare came on Sunday when Houston's daughter Bobbi Kristina, from her stormy 15-year marriage to singer Bobby Brown, was rushed to hospital to be treated for stress. She was later released.
Winners in key categories at the 54th Grammy Awards:
Record of the Year: Rolling In The Deep - Adele.
Album of the Year: 21 - Adele.
Song of the Year: Rolling In The Deep - Adele and Paul Epworth.
Best New Artist: Bon Iver.
Best Pop Solo Performance: Someone Like You - Adele.
Best Pop Duo: Body And Soul - Tony Bennett & Amy Winehouse.
Best Pop Vocal Album: 21 - Adele.
Best Rock Song: Walk - Foo Fighters.
Best Rock Album: Wasting Light - Foo Fighters.
Best R&B Song: Fool for You - Cee Lo Green and Melanie Fiona.
Best R&B Album: F.A.M.E - Chris Brown.
Best Rap Song: All of the Lights - Kanye West.
Best Rap Album: My Beautiful Dark Twisted Fantasy - Kanye West.
Best Country Song: Mean - Taylor Swift.
Best Country Album: Own the Night - Lady Antebellum