Music exists in a variety of sorts (I forgot how this double expression is called). There is music to dance to, music to march to (maybe a kind of dance too...), music to relax, music to meditate, music to express feelings, music to express thoughts, and even a 4-minute piece of silence.
If you look at music physically music is just a pattern in air pressure.
If you look at it phenomenologically, it's a pattern of sounds.
If you look at music psychologically, it can be used as a therapeutic instrument.
If you look at it from a biological viewpoint it can be used for a mating process.
If you look at music from an anthropological viewpoint it can be used for honoring the gods or maintain tribal coherence.
From a political perspective, it can be seen as an instrument for keeping the masses in control.
From a theological perspective, it can be seen as an instrument to come closer to god.
From a materialistic brain perspective, music can be seen as a (big) bunch of neurons firing in concert.
And there are more viewpoints that can be used at the same time. Philosophy is not contained in these viewpoints. But I can imagine it exists. How would it look like? Is, there a philosophy of music, just as there is a sound?