Duffy's extraordinary breakthrough was confirmed tonight when the Welsh singer took out one of the main categories at MOJO magazine's annual awards ceremony, held at the Brewery venue in east London.

The MOJO Honours List pays tribute to both classic artists and new music and always draws a heavyweight crowd of musicians and record industry executives, with winners selected by a combination of MOJO readers and the U.K. monthly music magazine's editorial team.

During the celebration, Duffy's U.K. chart-topper "Mercy" (A&M) was named song of the year. "It's a timeless song which is exactly why MOJO readers voted for it. It could really have come from any period in time over the last 50 years," commented the gala's host, Phil Alexander, editor-in-chief of MOJO magazine. Duffy's debut album "Rockferry" is certified double platinum in the United Kingdom (600,000 units), and is currently at No. 3 on the Official U.K. Albums Chart after 15 weeks.

In one of the surprises of the evening, the MOJO best breakthrough act award was handed to the Last Shadow Puppets, a chart-topping side project of the Arctic Monkeys' Alex Turner and Miles Kane of Liverpool group the Rascals.

Meanwhile, the prestigious MOJO best album award went to Australian alternative rockers Nick Cave and The Bad Seeds for latest album, 'Dig!!! Lazarus Dig!!! (Mute).

The annual awards party also paid homage to the careers of a raft of rock and pop legends, with the likes of Led Zeppelin, Paul Weller, Sex Pistols, Neil Diamond, Motorhead and the Specials all collecting gongs.

Led Zeppelin took out the best live act award, based on the surviving band's comeback performance last November for the Ahmet Ertegun tribute concert at London's O2 Arena.

Weller, the former frontman of the Jam and the Style Council, earned the MOJO outstanding contribution to music award, while punk giants the Sex Pistols were feted with the icon award. Heavy metal veterans Motorhead received the hero award, Diamond took out the classic songwriter award, and the Specials were inducted into the MOJO hall of fame.