Is is possible to patch a dungeon (not biomes) musicTrack value to have a list of ogg files it needs to play so it can play another music after previous music is finished playing while I'm playing Starbound?
there is a way, but it is inside the dungeon's file itself. look at the garden gate or story dungeon files using tiled, there is a box thingy that makes it play a specific sound/music inside the area. It will start when you enter the area though, not when the other music stops. I am pretty sure that the boxes on the outside "clear" the music from the box so that it reverts back to normal music, but have not tested.