A) Make sure the mod is enabled, along with all 6 addons.
C) Wait for track to play in game, if impatient or want to test,
1) In settings slide music volume to 0 and then back up to desired volume level. Restart game until main menu appears.
2) All tracks are coded as "main track" types which means if you start a brand new world you may not hear as wide a variety as songs until later in game.
D) If no music persists and troubleshooting has failed please list any OTHER mods (in particular any other sound mods as they don't always play nice with each other) you may have installed and I'll see what I can figure out in time.