I think Ne Cede Malis absolutely should not have music, and having it drastically alters its very deliberately ambient mood, therefore I can't recommend this addon to any Marathon Infinity newcomers. I even feel that the Electric Sheep levels would be better to have music than Ne Cede Malis.
Otherwise, I am enjoying this addon greatly, and I don't mind having music in any of the other levels.
An original fan soundtrack for Marathon Infinity, composed by Talashar. Featuring themes from Marathon, Halo, and M2SE. This won't just be a mashup of themes you know though, levels and character have been given their own themes to provide a new dimension to the game. Experience Infinity in a whole new way. Based on Treellama's M2SE plugin.
Preview my music here: https://talashar.bandcamp.com/album/strange-aeons
NOTE: MUSIC DOES NOT LOOP ENDLESSLY. This is intended. Many levels have added silence to allow the ambience some time on the stage. This silence is not a bug. Each level has been assigned specific tracks to emphasize narrative beats, emotional highlights, atmosphere, and overall vibe. If you would like looping versions of the songs, you can get them for free via the bandcamp link (click Buy Album then enter $0).
Recommended volume levels are 100% Master, 70% Music.
If you run into any issues with this plugin, I can be found in the Marathon Discord as @throkgaar.
Enjoy.