it seems that moslty music is a reflection of our emotional state, we relate to the vibe that resonates with us in that particular emotional state. which is why most enjoy many different genres of music. and even when people only like one genre, they still have diversity within :
example : most metal / rock bands have at least one ballad per album
but not all attraction to music is based on our emotional state, some may be intelectual intrigue . such as complex progressive, fusion, classical, jazz, and such. like enjoying a painting it can evoke our emotions or our minds. and sometimes both.