Currently working on a music block before getting back to work on new mobs tomorrow. Its setup so each map directory can have its own directory of music (needs to be ogg files). Then when you are in the music block UI you can select any of the music from the directory. Need to add an option to not restart the music if the same music is already playing, new block texture, and lang file entry.
Anyways what made decided I should go ahead and do the music block was watching Lawligagger's video of the dungeon he is working on.