I work with game music as a hobby and know a lot about snes/genesis stuff music-wise. So basically, without CD audio, the download would be like half of what it is, the majority of the rest being graphical / character files and the exe's themselves.
Little 8x8 or 16x16 tiles, these have little to no wasted space. The graphics also were stored in tiled format, where there was much repeating. Even many playstation games did this, and most all handhelds (playstation had same sony sound chip the SNES did, just higher quality 44.1khz instead of 32khz). On the SNES and GENESIS, only the song in piano-roll (like midi) form is stored, it plays the notes back from patch (genesis) or sample (SNES) data.
There's a good half hour of music per game or more, so that's half a music CD roughly, or 300-some megs. For what it's worth, the 16-bit consoles used a sample pool of instrument sounds from what I believe is a yamaha synth, that take up 1~2kb each instrument, and each song is 20kb.
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