I'm just curious, how does Nintendo use different music in PBR? In the Japanese finals last year, they used Mysterial's music in Sunset Colosseum, and in the Semifinals/Finals of the VG Showdown, they used this brand new music I've never heard before in Sunset Colosseum.
I have a feeling they manufactured custom discs for PBR with alternate music. After all, if they made specialized DSes and hack checking devices for the Showdown, why not custom music?