Pulled this from a post on Amazon:
"The music that Lars plays is a piece composed by John Mayer called 'Acka Raga'. The version/re-mix heard in the film is very similar although not identical to the Mint Royale track - 'From Rusholme with Love'(which uses samples from Acka Raga)."
What I'd like to know is what is the song that is played while Jon is reading the obituary (near the end of the movie). It's not on the soundtrack and I can't find information anywhere on the web (which amazes me).