ITunes

iTunes is an app on iOS systems that sell many music tacks and singles including ones from the Sonic the Hedgehog Series. They have been seeling music tracks realted to Sonic ever since the Sonic Rush soundtrack by the name of Original Groove Rush and the Sonic Riders series' soundtracks were released. After that they have sold the soundtracks to Sonic the Hedgehog 4 Episode 1,Sonic the Hedgehog 4 Episode 2, Sonic Colors, and Sonic Unleashed . For Sonic's 20th anniversary they released the Sonic Generations soundtrack along with releasing a sountrack from past sonic games with the name "20th Anniversary edition" attached to the end from the oldest game being the Sonic Adventure sound track and the newst being the Sonic and the Black Knight.