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The Pipe Organ Database is neat. It has the location of thousands of pipe organs.
A lot of those places are closed or demolished, though, and 95% of them are in churches that don't have concerts. Kind of a shame that there's a pipe organ a few blocks from me, but I can't really hear it play unless I wait through an hour of talking about The Lord.
Around here, you have to go downtown to a church to see a pipe organ show. Which I guess is better than nothing.