Annual survey also names Yuck and Warpaint on 15-strong list
The annual poll is voted for by over 160 music journalists, commentators and tastemakers, and was won last year by Ellie Goulding.
The longlist is:
Esben & the Witch
The Naked & Famous
The winning act and a top five will be announced early in January. See Bbc.co.uk/news/entertainment for more details.