What is "music of the Islamic world"? Four possibilities

depends on meaning of "Islamic world"...what kind of world is that?

1. Music of Muslims? (Muslim world) (objective but incoherent)
2. Music of Islamic urban cultural centers during period of ascendency? (Islamicate world) (somewhat coherent, somewhat objective)
3. Music (sound) of Islamic ritual practice? (coherent, objective, but limited)
4. Music expressing Islamic spiritual ethos? (coherent, subjective)

We'll examine two possible meanings and their interrelation:

1. Sound of Islamic ritual practices
2. Islamicate music