You might notice that every culture ever has had musical traditions that all cultures use music in their rituals. That means music is profoundly salient to humans, though why it should be is still not known. Music of course is processed first in your auditory cortex - the brain area analysing all signals from the ear. But music isn't noise. It has mathematical relationships in chords and across time in composition. It also sends precise, ordered information, and so excites language areas. For whatever reason, music is able to cause strong emotion (movies without sound tracks feel very different), and emotion comes from your brain too, and ties into memories and social brain centers too.