I have something I practice recently.
That is this Otamatone.
This is one of electronic instruments．
When you press the black switch, you hear a sound.
There are two types of volume and three kinds of octaves.
How to hear the sound changes when you open or close it's mouth.
It is very difficult to master.
But it is also an instrument that can make a very interesting performance.
If you are interested please try searching for videos.