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“We went to the rehearsal and it was exciting — exactly like the show — and the piano sounded so nice. So often they have black grand pianos and it’s just ‘plink, plink’ but this one…” She sighs, remembering.

And the ingenious, rhythm-forward production of “Boomerang” makes her obsession sound like a village-wide celebration, with the plink of a thumb piano, flamenco-like handclaps, a thudding reggaeton bass line and a rowdy backup chorus that cheerfully supports her misplaced affections.

In a review of her second solo album, “Both Worlds *69,” the Atlanta Journal-Constitution praised Gangsta Boo’s versatility: “Over slight variations of the same round-and-round keyboard plink, Boo becomes a sassy stripper confronting cheap patrons on ‘Can I Get Paid?’.

But inside this room, Parker’s audience is clearly made up of the nightlife’s most committed citizens, and once their conversations go quiet, assorted glasses and bottles continue to plink from behind the bar, sending some kind of Morse-coded announcement about verisimilitude: The jazz you are about to hear really happened somewhere.

One by one, they dropped into a tin can with a dull plink, and the surgeon then began sewing up the wound.