Music items are some of my favorite items in the game. However, at the moment, we don’t have very many readily available. Here are some of my suggestions.
PSMD) Tree of Life: Roots
Perhaps this item can be found in Ashen Graveyard as an end box item. Additionally, since Archipelago Thicket doesn’t have a Secret Room, it could be added there if one is created.
GtI) Stony Cave
Rocky Ravine is rather underwhelming in terms of use right now, so why not add a music item to its end boxes? I’d suggest one that plays Stony Cave from Gates to Infinity.
SwSh) Slumbering Weald
The bosses of Mystic Coven don’t drop anything, so maybe one of them could have a rare chance of dropping a music item?
SwSh) Tower of Darkness
SwSh) Tower of Waters
Maybe the left/right bosses of Tanren Training Dojo (Hitmonlee and Hitmonchan) could have a chance of dropping a music item? That could make TTD a little more fun to run.
BDSP) Lake Cavern
I feel like SA depths needs something, so perhaps a music item could be a rare boss drop from the Lake Trio.