Um, this is a hard question. I don’t think with thorough social science experiments we can make any concrete conclusion for this one. My personal opinion is: the music taste is related to some part of personality, but it does not define things like how nice a person you are etc,.
I think it probably does, to some extent. Some of what we find pleasant in music depends on our culture, and what we have been exposed to. (For example, minor chords usually sound ‘sad’). Certain arrangements of notes sound like they ‘go together’, which is partly based on our brains, but also partly based on the kind of sounds we have grown up hearing. And maybe the reason you like a certain song is more about when/where you heard it, and what it reminds you of, than how it actually sounds!