MI2 and CMI feature the LeChuck theme, a little bit, but for some reason they've made it quiet and slow. In the original game, it's a high-energy, in-your-face evil theme rather than trying to be a subtle background element. I hope that will be true again in RMI...
I've done transcriptions of the MIDI data included in the game for a few of my favorite themes:
https://musescore.com/user/36584999/scores/6891053 (opening theme)
https://musescore.com/user/36584999/scores/7810499 (ghost ship)
https://musescore.com/user/36584999/scores/7725812 (LeChuck)
MI2 and CMI feature the LeChuck theme, a little bit, but for some reason they've made it quiet and slow. In the original game, it's a high-energy, in-your-face evil theme rather than trying to be a subtle background element. I hope that will be true again in RMI...