Vibrations that are, have been, or potentially could be heard by a listener. Generally formed by a cognizant composer, with motives ranging from mathematical beauty to "shout outs" to said creator's "niggaz".
So, John Cage, GG Allin, Wesley Willis and Tupac are at a café in Hell exchanging their infinate musical (adj.) wisdom among themselves...
Indefinable by words alone. It is not only something you hear but what you feel. It is something your soul can reach out and touch. It originates from all over the world since time began. Complex or simple, fast or slow, loud or soft. It is what you feel, or it could be your method of escape or it could just keep you alive.
All music is miraculous.
“That's the beauty of music. They can't take that away from you.” ~Red~ -The Shawshank Redemption