Elbow also won last year's Mercury Music Prize last year
Indie band Elbow are celebrating a double win at the Ivor Novello awards, including the main award for best song.
The group, who claimed last year's Mercury Prize, triumphed with One Day Like This while Grounds For Divorce won best contemporary song.
The Ting Tings and Duffy also picked up Ivor Novello awards, which honour excellence in music writing.
Winners of special achievement awards included electro pioneer Vince Clarke and Motown legend Smokey Robinson.
Dance music veterans Massive Attack and Scottish singer-songwriter Edwyn Collins also won special awards.
Picking up Elbow's first award for best contemporary song - beating songs by Dizzee Rascal with Calvin Harris, and The Ting Tings - lead singer Guy Garvey said: "It's a great honour against fierce opposition with some great songs."
Elbow frontman Guy Garvey talks to the BBC about the double win
Returning to the stage at London's Grosvenor House Hotel for the main prize, he added: "This is really something else.
"I'm gonna talk about being in the band for a moment.
"We've got this great support surrounding us from our friends and family but, on a personal note, I'd like to say that, if nothing else ever happens to me in my life, these four boys have made the whole thing worth every single second."
Picking up her award for most performed work Mercy alongside co-writer Steve Booker, Duffy thanked those who had helped shape her career.
"I was a girl from Wales, I did not know what music was.
"I knew I had a set of pipes and that would get me a frigging long way."
Eg White, who co-wrote hits including Adele's Chasing Pavements and Warwick Avenue by Duffy, said it was "very exciting" to win the award for the "fun, fast, quite scary" art of songwriting.
I think creativity is a gift from God - some people get gifts from God
Manchester band The Ting Tings could not pick up their award because they were touring Europe, while Coldplay were unable to claim their best-selling British song gong for Viva La Vida because they are on tour in the US.
Radiohead's Jonny Greenwood, who won best original film score for There Will Be Blood, was also absent.
It was left to the veterans, instead, to show how to deliver a speech.
Smokey Robinson, 69, told the audience he had flown to the UK for one day to pick up his special international award.
"I think creativity is a gift from God - some people get gifts from God.
"For everybody in this room, creativity is your gift and it's what you get."
He said song writing "just happens".
"It could be in your car or in the toilet and something comes. Sometimes it's a song."
Meanwhile, Vince Clarke, who has had hits with acts including Depeche Mode, Yazoo, The Assembly and Erasure, simply said it was "a real honour to get this award".
Organisers said it was the first time in his 30-year career that Clarke, 48, who won the outstanding song collection gong, had turned up to pick up an award.
Massive Attack's hits include Karmacoma and Teardop
The biggest applause of the ceremony was reserved for Edwyn Collins, 49, formerly of 1980s Glaswegian band Orange Juice and best known for 1994 hit A Girl Like You.
Collins, who walked to the stage with a walking stick to pick up the inspiration award, suffered two brain haemorrhages in 2005 before spending a further six months in hospital after a surgical scar became infected with the MRSA bug.
He said that when he was in Orange Juice he was "a pretty arrogant man, but not any more".
He added: "I'm writing away, 10 new songs at the moment and it truly is fantastic.
"It's good to be back. Cheers for the special award."
Bristol dance music collective Massive Attack won the outstanding contribution to British music award.
Founding member 3D - real name Robert Del Naja - said it was "dishonest" to stand on the stage without the many singers they had collaborated with.
They include Shara Nelson, on anthemic 1991 hit Unfinished Sympathy, and Everything But the Girl singer Tracey Thorn on 1995's Protection.
This year's fellowship award went to veteran lyricist Don Black, 70, who co-wrote hits including Born Free and Diamonds Are Forever, as well as musicals including Aspects of Love and Bombay Dreams.
An audience of songwriters, record company executives and pop stars included Damon Albarn, Sophie Ellis Bextor and Rolf Harris.
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