Here's why:
* Noun: A noun is a word that names a person, place, thing, or idea. In this case, "rocks" is referring to a type of music, which is a thing.
It's important to note that the sentence itself is grammatically incomplete and might be missing words like "about" or "to learn." The word "rock" could also be a verb, meaning to move back and forth, but in this context, it's more likely to be a noun.