Thanks again, guys. What i wanted was for any passerby (7 at a time would be fine) to be able to pair with the transmitter, have a listen, hopefully put something in the hat, and be on their way. Requiring they have a specific device obviously is a non-starter. I WANT a silent concert except for those who want to hear, so no hassles with noise pollution. And without the audience needing anything more than their phone to access the audio.

Any alternate ideas appreciated...

It's all about the music.
(I keep telling myself that...)
http://www.davidkempton.com