The music that was playing at the 30 min mark were both Weezer songs from Pinkerton. Specifically, the songs No Other One and Across the Sea from that album. 2004 must have been around when Pinkerton started getting a resurgence after getting slammed after it's '96 release, but I don't know that part for sure. Maybe someone at Gamestop/E3 just really liked Weezer.
metasaval's comments