I am somewhat surprised, no one has correctly defined "music" in this thread.
"Music" at its core definition: A Greek word that means, to offer praise. If you look at the definition of praise, you find it to mean, to give power to a subject.
Music can be recited poetry, without any melody at all. It can be screamed, growled, howled, yelled or sung. The harmony, melody and beat are not really disciplines of music at all. All that matters is this; "music" must offer praise to its subject, or give power to its subject matter, with a time. Music is spiritual. Therefore, anyone who recites, sings or plays, while feeling the message in the music, is offering praise(power/strength) to the recited subject and is performing music.