I say that if PD is looking for some good music, there are two sources. One from my Gamecube, the other from a 6-CD Collection from an FYE store (that I should have bought, but elected not to). One was some sort of summer tour for Ibiza from 2001, the other is FIFA 2002. I don't know if I want to get the latest FIFA Soccer game from EA, the Winning Eleven Seven game, or Rugby 2004 (I'd probably want to play rugby more), but the music from soccer/football is really high-energy, and is highly appropriate to soccer because soccer is a high-energy sport. But then, auto racing can be high-energy. And as an avid fan of electronica whether it is generic or pulsating, GT4 should put in some more techno. I mentioned Ridge Racer V before because the techno in some of the Namco games has some good beats, even if they are a bit dull. I mean, play Tekken Tag Tournament or RRV and check out the music.
So my "suggestion" would be more electronica. I've gotten into techno since watching MTV show "Amp" back in the mid-late 1990s with Prodigy and Chemical Brothers and all. I've also gotten into it by playing games from the WipeOut series, which has to be the best futuristic racing game series ever. I wasn't very excited with F-Zero, even though Captain Falcon kicks ass (literally) in Super Smash Bros. Melee. I mean, I'd rather listen to some pulsating beats from Europe or America or even Japan than "Sweet Home Alabama." Now if you'll excuse me, I have a German Bundesliga (or however you spell it) match on my Gamecube going. Toodles!