Juan Polvillo, one of Spain’s most famous flamenco dancers, prefers sad dances to the happy ones – he can reflect more. You can see for yourself when Compania Flamenca Juan Polvillo brings its fiery – and reflective – musicians, singers and dancers to Joe’s Pub (7:30 and 9:30 p.m.; 425 Lafayette St., at Astor Place; [212] 539-8770) for two shows nightly on Tuesday and Wednesday. Dancers Polvillo and La Maha (pictured) will appear along with singers El Tañe and Natalia Marin and guitarist Jose Manuel Tudela at this annual flamenco showcase. Best of all it’s free. Just call to make reservations.