According to this forum post
, in the PAL version of Tony Hawk's Pro Skater (i.e. Tony Hawk's Skateboarding) the following three music tracks that were present in the NTSC version:
Vilified - Even Rude
Screamer/Nothing to Me - Speedealer
Euro-Barge - The Vandals
... were replaced with these three:
Le Hot - Grand Unified
Ain't Got Time to Waste - Aim feat. YZ
Blue Thunder - Aquasky
I wonder if it would be possible to insert all six tracks (three region-exclusive + three from the opposite region) onto a single game disc/image and edit the game's playlist to play the additional tracks, ideally in alternating order (region-exclusive -> opposite-region-exclusive -> region-exclusive, etc.).
I'm not sure if the Playstation version would have the extra space to accommodate the extra tracks, but I'm pretty confident that the Dreamcast version would (in GDI form at the very least).