The BBC's Sound of 2009 list aims to highlight some of the best new music talent for the coming year.
A longlist of 15 acts was published in December, and the winner, as well as the order of the top 10, has now been revealed.
More than 130 of the UK's top music critics and broadcasters - from magazine editors and music writers through to DJs and producers - took part.
They were asked to name their three favourite new music acts, which could be from any country and any genre, but must not have already had a UK top 20 single or album at the time of voting.
They must have been new to the British general public and must not have already been famous for any reason (such as already being a member of a hit band or being a soap star) or have been finalists on TV talent shows such as X Factor or American Idol.
The responses were counted and the acts with the most votes put in order on the list.
Now in its seventh year, the Sound of... list is compiled by the BBC entertainment news team.
Adele was crowned number one in Sound of 2008, followed by Duffy, The Ting Tings and Glasvegas.
The other winners have been 50 Cent (Sound of 2003), Keane (Sound of 2004), The Bravery (Sound of 2005), Corinne Bailey Rae (Sound of 2006) and Mika (Sound of 2007).
Other artists in the top fives in previous years have included Franz Ferdinand, Wiley, Razorlight & Joss Stone (Sound of 2004), Bloc Party and Kaiser Chiefs (Sound of 2005), The Feeling & Guillemots (Sound of 2006) and Klaxons (Sound of 2007).