ZigBee for Audio Communication?????

"Audio Communication"? Do you mean wireless audio, and do you mean multiple devices sharing and repeating that audio signal? Or do you mean audio control communication, Control4 style?

multiple devices sharing and repeating audio signal and control using audio

ZigBee is designed for very low bitrate command and control type signals. Realtime audio needs much higher data rates.

Would be pretty cool though, imagine a lightbulb socket speaker you could screw into the ceiling.

Look at HomePlug AV.