At some points in the levels the music does not play when it should, such as ambushes and boss battles.
This bug happens in all levels (including DLC levels), in this example the level is used: The Stronghold, from The Echoing Void DLC:

One way to fix it is to cross a door to another area of the level but there had to be an ambush or a boss battle right there so that when you return, the music playback returns to normal and the song is finally heard, than before. it did not reproduce.