You have heard these sounds more recently than you think. The aesthetic of low-bit nostalgia is exploding.
These are direct recordings from the Genesis chip. Websites like Sega Genesis Soundfont projects offer raw .WAV samples extracted via a modified console. 100% authentic. Cons: Very low fidelity (22kHz, 8-bit). They sound thin in a modern mix. sonic 1 soundfont
Here is the reality: Sega owns the copyright to the recordings and the melodies . However, a Soundfont that contains re-synthesized waveforms (not direct ROM rips) is generally considered a transformative tool. You have heard these sounds more recently than you think