This is an Xboxexclusive BanjoKazooie glitch (or oversight for that matter) where you can duplicate notes using Furnace Fun. If you don't collect the notes in the TTC Sandcastle, BGS Choir, BGS Mr Vile Room, or GV Matching Pyramid, you can find them inside their Furnace Fun Minigame counterparts. You can collect these notes and they will stack and apply to a world if the note count is lower than the amount you have stacked in Furnace Fun. Currently, this is a way to get over 100 Notes in GV, TTC, or BGS since these notes respawn in their worlds. If you really wanted to (and had hours on hand you weirdo), you could collect up to 255 Notes in each of these worlds (It loops back to 0 after 256).