The song is "It Doesn't Matter" by Tony Harnell & Ted Poley, Sonic's theme in Sonic Adventure 2 Battle. The clips are from; Sonic Heroes, Sonic Adventure, Sonic Adventure 2, Sonic and the Black Knight, Sonic: Night of the Werehog, Sonic Riders, Sonic Riders: Zero Gravity, Sonic Unleashed, Sonic the Hedgehog: the Movie, and Sonic X.
Copyright: Sonic the Hedgehog and related characters and indica © and ™ 1991 - 2006 (e.g. presnt) SEGA, Sonic Team. Sonic X is, respectivly, produced and animated by SONIC TEAM, TMS, 4Kids Entertainment and Jetix. Sonic X © 2003-2006 Project SONIC. No copyright infrigment intended.