Well, I managed to rip all of the music from these games. These are perhaps the cleanest rips possible from an emulator.
Lemmings:
MP3,
WAVOh No! More Lemmings:
MP3,
WAVHoliday Lemmings:
MP3,
WAVInterestingly, the Holiday Lemmings Mac soundtrack appears to have been composed for the Roland MT-32. Here are the MIDI files, as well as recordings of these files made with a recent version of Munt (an MT-32 emulator). Note that the MIDIs require an MT-32 (or a compatible device or emulator) for proper playback; they are <em>not</em> compatible with General MIDI.
Holiday Lemmings (MT-32):
MP3,
WAV,
MIDI