Music Sonic and the Secret Ring by Kenichi Tokoi, Fumie Kumatani, Seiroh Okamoto, and Hideaki Kobayashi

Sonic and the Secret Ring - The Palace That Was Found

Blood Flow (Knuckle's Theme) - Sonic Frontiers The Final Horizon OST

These themes are all from Sonic Heroes. 4 from the teams, 1 is the main theme, and the other from a secret.

Download: http://www.4shared.com/postDownload/6RGrB2Trce/Sonic_Adventure_2_Official_Sou.html