I found this video showing off a glitch when Earthworm Jim is played on a Model 1 Sega Genesis. When the Stage 1 music plays, in certain spots it halts temporarily, but not on the later revisions. i'm not sure which revisions this exists on, but i tried it on my TMSS HDG model 1 and it actually happened exactly like in the video. it also seems to only affect this one song. I'm curious what could be the cause of this glitch, if it's a widespread thing, and if it can be fixed, since now that i've heard it i cannot unhear it, and it seems weird that a glitch like this could be so unique to a specific game and hardware. here's the video:
