For speedruns or just fun you can use any item as an Ocarina without having an Ocarina! Catch a bug in a bottle. Then drop it and catch it again. Then without moving backflip and while in the air press the button the bug is in and then the button of the item you want to play. If done correctly the player should be playing the item as an Ocarina! This is extremely useful for speedruns or if you don't have an Ocarina.