Is this making music like playing an instrument or composing or what?
Playing an instrument.
To compose is "zenét szerezni". Literally, "to author music".
but making music is composing
I am not sure that is correct. Writing music is composing but making it is more like playing an instrument, etc.
But if you are a jazz musician, the two can definitely mix.
Why is it not correct "You are PLAYING music"?
It's accepted now
You play music should also be correct
Just to clarify: Does "making music" in Hungarian mean the same thing in English: to play instruments, to sing, or to do both? That is, to make music sound--by any means?