It isn’t a big secret. Sonic The Hedgehog did not receive the best representation as one of the most known Gaming icons, in Super Smash Brothers. Neither has the selection of music featured. There would be so much room for adding more Sonic bangers in Smash.
I recently had a little talk about that topic, not mainly or only with Sonic but even they said well yes they should have added for example “What I’m Made Of from Sonic Heroes” etc.
Out of this idea i started to create two Youtube playlists with Sonic music of which i think they could have been a good addition to Smash. Check it out, maybe you’ll agree or even disagree with some of the selected music.
Enjoy and have a nice day