With current rulesets and functionality, it is possible to define custom music for every aspect of the game.
https://www.ufopaedia.org/index.php?title=Audio_Options_(OpenXcom)#Custom_Music As I have worked on a custom set for my PirateZ LP, I have discovered that only Geoscape and Tactical tracks loop. (Resolved Below)
1 . I would like to request that the looping functionality be added to the other tracks like Main menu, mission briefings, end of game, etc. (Resolved Below)
2. Could it be possible for the engine to shuffle through the available GMGEO, GMTACTIC, and GMINTER tracks that are defined in the ruleset, rather than just picking one and looping it as it currently does?
Cheers, Ivan