Way to disable enemy music?

[Hardarm]

You can edit a copy of that monster and remove its music.
Use model editor or open the .ent file as text.

That's not really what i targeted for, the monster wouldn't have music at all then. Thanks for your effort though.

Make the priority of the monster's music a bit lower, say like "0.25" (in the monster's .ent)
And make the music of the event have an higher priority - "0"