Golden Glissando (the artist formerly known as ThePianoGuy27) has joined in on writing sheet music for some different instruments. In this case, he shared trombone sheet music for the Title Theme. It's really well done! Golden Glissando also says the same sheet music could be used by other instruments, such as the euphonium baritone or bassoon.
Find the sheet music here, or listen to a midi here. You can also visit his Youtube channel.
Thanks, Golden Glissando!