Guitar Hero World Tour Music Creation Demonstration
1Up has a video of a detailed demonstration of Guitar Hero: World Tour's music creation system from GamesCon 2008. Activision shows off its robust note-recording system, which features dozens of different tones and sounds as well as the ability to play full musical scales. Tilting the guitar up and down can change octaves (or loudness for the drum machine). Users will also be able to record loops and tweak them for inclusion in full songs, which can accommodate all four players. The songs can then be uploaded and shared with the community.
You're right. I feel the same way about driving games. Instead of buying Gran Turismo XXXIV or whatever the game-du-jour is, why don't these people go buy an actual performance car, or at least soup up their own? The differences, as you point out:
Controller: you do the button-pushing/joystick-waggling thing; some people appreciate it; you go home with the admiration of a small clique. Plastic junk you eventually garage sale.
Performance car: you actually learn how to fix, maintain and upgrade; more people appreciate it; you go home with the hot brunette from the car show. Not limited to tracks/cities included in games. Performance car has way better resale value, and if you pick the right one, reselling it on eBay might even subsidize your retirement.
(Or is your point only valid for music games..?)