Since Sonic CD the Sonic the Hedgehog games each had there own theme songs. Here is a list of each games theme songs (note some of these songs are also the final boss fight or character theme songs):
Sonic CD: Sonic Boom (Pastiche)
Sonic 3D Blast: You're my hero (Debbi Morris)
Sonic R: Super Sonic Racing (T.J Davis)
Sonic Adventure: Open Your Heart (Crush 40)
Sonic Adventure 2: Live and Learn (Crush 40)
Sonic Heroes: Sonic Heroes (Crush 40)
Shadow The Hedgehog: I Am...All of Me (Crush 40)
Sonic Riders: Sonic Speed Runners (Crush 40)
Sonic The Hedgehog 2006: His World (Crush 40)
Sonic and the Secret Rings: Seven Rings in Hand (Runblebee and Steve Conte)
Sonic Rush Adventure: A New Venture (Tahirlh Walker)
Sonic Riders Zero Gravity: Ungravitify (Cashell)
Sonic Unleashed: Endless Possibilities (Jaret Reddick)
Sonic and the Black Knight: Knight of the Wind (Crush 40)
Sonic & Sega All Stars Racing: So Much More (Bentley Jones)
Sonic Free Riders: Free (Chris Madin)
Sonic Colors: Reach for the Stars (Cash Cash)
Sonic Lost World: Wonder World
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There are several Sonic the Hedgehog theme songs. Often sung by Crush 40 or other various artists.
Free Sonic games can be found on a number of websites. Sonic Games, Daily Games, Games List, and One Online Games all feature free online Sonic games.
Here are the Sonic games for the Wii: Sonic and the Secret Rings, Mario and Sonic at the Olympic games, Sonic Unleashed, Sonic and the Black Knight, Sonic Riders Zero Gravity, Sonic Colors, Sonic The Hedgehog, Sonic & SEGA All-Stars Racing, Sonic made an appearance in Super Smash Bros. Brawl, but that's not an actual Sonic game.
The theme songs were sung by Utada Hikaru. The songs are 'Simple and Clean' and 'Sanctuary'.
Silver the Hedgehog is a fictional computer character first introduced in the Sonic the Hedgehog series. Games that Silver the Hedgehog has appeared in include: Sonic the Hedgehog, Sonic Rivals, Sonic Rivals 2, Sonic and the Secret Rings, Sonic and the Black Knight, Sonic Riders: Zero Gravity, Sonic Free Riders, Mario and Sonic at the Olympic Games and Sonic Generations.