They plug into any amp. They feedback bad in a PA system. Yes, I've seen O, Brother, Where Art Thou? Back in the 20's and 30's, that's what they made microphones out of. In the late 30's the magnetic microphones started being used. My wife buys the burlap from a craft store.
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Those are nifty! :-)
Wait... do you eat the soup first? :-o
Does Gitty sell burlap screen?
Did you see Oh Brother Where Art Thou where they sang into the can?
Are you using speakers for the mics?