Jes Aznar for The New York Times

Rodolfo Gregorio, right, at a General Santos karaoke bar. Filipinos, who pride themselves on their singing, may have a lower tolerance for bad singers.

Next, he belted out crowd-pleasers by Tom Jones and Engelbert Humperdinck. But Mr. Gregorio, 63, a witness to countless fistfights and occasional stabbings erupting from disputes over karaoke singing, did not dare choose one beloved classic: Frank Sinatra’s version of “My Way.”

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