So at any time I generally have 2 pieces of music playing in game at the same time. One is veeeeeery faint while the other is at the volume i set in the options and drowns out the second one. However periodically the one I can hear will fade out, such as with the combat to explore transition, and i can hear the other one until the next song starts (if it starts).

This brings me to the other part of this problem, the only way to get the music I can actually hear back is to move the volume slider in the the options menu.
Its not really a game breaking problem though. just odd.