[3.1.2][MINOR][MUSIC] Umbra Nighttime Music not Playing

[Mudkip45]

I noticed that the track that plays both underground and on the surface at night doesn't play anywhere anymore, and there is no music at nighttime on the surface at all.
Now it gets quiet when it's dark…a little too quiet!

[Mudkip45]

In addition to Umbra, there is also the track on Thetis that plays throughout the planet (the slower music with waves in the BG, no names for the tracks) and it seems all the newly added ambient tracks for each planet doesn't play, either! x:

[XsX]

Should be fixed, thanks! Locking.