| http://www.w3.org/ns/prov#value | - Everyone else, including Horvitz's groups, depends on church-style pay envelopes and teasing reminders from the stage to make a (rather modest) suggested donation of $5 to $15. (I like to pay by the set, as at the old Preservation Hall.) This lets curious rookie listeners and chance drop-ins sample and flee, or maybe stay and discover aural capacities they never knew they had.
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