This is the midi collection of songs from the Sonic games, cartoons, and music albums. These were much more popular in the 90's before websites like YouTube allowed people to listen to the actual song. Midis are still being created by people as a hobby.
This comic began where Sonic X left off back in 2009. But unlike Sonic X, Sonic Universe focuses on the many other characters of the Archie Sonic universe, not just on Sonic.