The Problem of Scrolling Clouds

Some extra footnotes for the above video that I didn't think were worth including:

1/ To get the music working with the "don't preload" mode, a small sub-heap is allocated inside the main one for... reasons. It works fine if the songs are just allocated to the main heap, so... eh?
2/ If you insist on keeping the DMA channel the same, there were many other, simpler ways to get this working. Like... why not just make the bosses load their own music?
3/ This whole "do stuff based on the background" seems to have been a dev favourite way of determining things, as a number of other things is tied to it. For example, whether the moving stair graphics should be loaded into Ghost House levels is ALSO tied to the background.

Music timestamps:
0:02 Hall of Hieroglyphics (Wario Land 4)
1:00 E. Gadd's theme (Luigi's Mansion)
2:38 Domino Row (Wario Land 4)
3:18 Course Clear (NSMBDS)
3:23 Minigame VS Results (NSMBDS)
3:45 Mystic Lake (Wario Land 4)
4:43 Western Land (Super Mario Party Jamboree)
6:20 Filthy Nuclear Bunker (Hiveswap Act 1)
7:17 Hotel Horror (Wario Land 4)
8:10 The Gigantic Weapon (Professor Layton and the Unwound Future)

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