a person who is musical

a Determinative

— A is used when the following word could be any of a certain type. Compare "A book I saw on the shelf" and "The book I gave you yesterday".

a Noun

— A is the first letter of the alphabet. The letter "a" comes before "b". — In some schools, an A is a very high grade. Ron got an A on his earth science test.

person Noun

— A human. She is a kind person.

who Pronoun

— You use who to add a clause to explain more about the person or people you're talking about. They are good people who are working hard. We saw Kim, who was in his car. We asked everybody who was there. It was you who lost the keys, not me. — You use who to ask about a person or people. Who was on the phone? Whos your new teacher? Who did you meet today? He told me who was there. I'll ask who can help us.

is Verb

— A form of the verb be when talking about someone or something else. He is late for class. Is it hot in here?

musical Adjective

— If something is musical it makes music or is about music. A drum is a musical instrument. — If a person is musical, they are good at making music or often make music. My cousin is very musical and can play many songs and musical instruments.

musical Noun

— A musical is a theatrical production with music, dance, and spoken words. My favorite musical is "Wicked". Busby Berkley's old-time Hollywood movie musicals are classics. Tom and Jerry honeymooned in New York City and bought tickets for three Broadway musicals.