the real main music for both sonic the hedgehog 4 episodes. the screenshot for the music is the real start up. all goes to sega. for music it's http://sonic.sega.jp/SonicTheHedgehog4/swf/sound.mp3 (to download the music hold right side of mouse, click and download it) for website here are a few:
united kingdom: http://www.sonicthehedgehog4.co.uk/en/

american: http://www.sonicthehedgehog4.co.uk/us/index.html

japan: http://sonic.sega.jp/SonicTheHedgehog4/

australia: http://www.sonicthehedgehog4.co.uk/au/index.html