Scott Pilgrim vs. the World Forum

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So on the soundtrack there are several songs that are listed as being performed by Sex Bomb-omb, and so I looked up who exactly performed the songs and was surprised to find that the songs were performed by the actors that played the members of Sex Bomb-omb and Beck. My question is this: out of curiosity, does anyone know how much Beck contributed tot he performing of these songs? Because the voice sounds like that of Mark Webber (who played Steven Stills) and if each member plays their characters respective instruments, where does Beck fit in?

 Beck composed the music played by Sex Bob-omb in the film, and two unreleased songs can also be heard in the teaser trailer.    

Thats what it says on the SPvTW wikipedia page. I checked out the link that cited it and the second part is definitely  true. As for the first part, it also seems to be true, check this out  
 http://en.wikipedia.org/wiki/List_of_Scott_Pilgrim_soundtracks#Track_listing

Thanks :)