Musician.
That's a music composer.
someone who likes Bob Marley music is simply someone with good taste
You call that person a Metal Head. \M/(>.<)\M/
A music teacher.
It means someone individually plays a short piece of music (usually the leader), and the rest of his/her band replies to it by doing another short piece of music.
A person who studies music is typically referred to as a music student or a music scholar, depending on the level and focus of their studies.
You call someone that studies metal a metallurgist.
A physicist.
a person who studies planets is a planetologist.
There is no special name for someone who studies Hebrew.
florist
Microbiologists
An Anthropologist.
malacologist
A Zoologist
Brocollogist
A physicist.