This is SUPER minor, but the end of level jingle is counted as a sound effect in terms of muting rather than music. I think it's more suited to counting as music because it's longer that other sfx and a tune. I always have my own music on (I listen to A LOT) when I play lemmings so I keep music muted and the end of level music tends to disrupt it.
This is a valid point, but due to that they're often-used, and that anything considered a "music" is loaded only when being used and can only have one loaded at a time (whereas sound effects are loaded in advance and kept in memory, and can be any number of them in memory), treating them as sound effects works much better from a coding point of view.
With that being said - on the Config Menu there are options to turn them off altogether, seperately from turning off regular sounds or musics.
OH!! I never noticed those options before :XD:
Well there's my problem fixed haha