Tip: Switch palace switches normally disappear if you replay the level. However, if you insert them as direct Map16 and use the hex-edit at $00EEB2 in the ROM map, you can replay the level without a problem.
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Details for Crypt of the Necrodancer - Steinway to Heaven
SMW Music - Crypt of the Necrodancer - Steinway to Heaven
This sounds good overall, but I've got some minor suggestions: the volume on the @4 could be lowered a bit to prevent sound effects from being drowned out, and upon double-checking, "$F4 $02 /" once instead of "r64 /" on every channel does in fact work, if you want to save about 0x14 bytes. Feel free to update.