When I herad some of the music for Ouendan 2 I was trying to look for it. Yet I can't find them. The songs in question are:

SMAP - Bang! Bang! Vacance
Ken Hirai - Pop Star (I think the albums name was Utabaka or something like that)

I have ken hirai's utubaka album :) i love his voice..

couldn't find it

I can get both of those.(in fact I have the files for them already)