If you are an amateur, is it better to study photography or music?

Music should be obscure. Without a master, it may be difficult to get started, and the threshold for self-study photography is much lower. Of course, I don't know your age. This is just a personal opinion. In fact, it is possible to give consideration to both. If conditions permit, you can actually invest a little more. I don't know which is better. As for the difficulty, that's it.