The first concept for the story of Sonic The Hedgehog, was the protagonist being a lead singer of a rock band. However, this idea was discarded shortly before the release of the final game in 1991.
We do not know if both games were developed simultaneously for the Master System and Genesis. But the Ancient company left an Easter Egg in the end credits of the Master System version.
In Encore mode, we can find a big surprise!
The Sonic Remake Band. Yea! This looks really cool. In this fan remake universe, we can clearly see this concept alive.
This update will be available soon. And I take the opportunity to say that I'm working on a new Feedback platform of our games, for players and developers.