Ah, I really wouldn’t worry about it then, unless, like you say, you end up with enough unique views per month that you’re offered to join AdSense, and that wouldn’t be for a good while yet if you’re just getting started.
Play your music, and let everybody enjoy seeing and hearing it!
YouTube uses programmes to automatically detect copyrighted materials by searching for familiar patterns in sound and images, e.g. a copyrighted song, or a scene from a film. That’s why people who upload films to YouTube flip the image, or insert the image into a screensaver, or slow the soundtrack by 30%. To trick the programme.
If you’re playing the instrument yourself, you will be creating a new sound, so you don’t need to worry about being “found”. I don’t know the exact logistics for music, as to what you would need to do further down the line if you are offered AdSense, but certainly I have seen some creators show clips of them playing piano, etc, and playing popular songs, and there’s been no copyright claims on their videos.
If you do reach that point with your YouTube channel, maybe reach out and get some legal advice, though, because if YouTube gives you three copyright strikes, you end up with your account being deleted!