AFTER THE BLUES

Rosemary George sings a program straight from the post-Depression era, with selections made famous by Billie Holiday, Bessie Smith, Sarah Vaughn, and other jazz greats. Tonight, 6-8 p.m., Cornelia Street Cafe, 29 Cornelia St., between W. 4th and Bleecker streets, 212-989-9319, $13 general, $11 seniors and students, admission includes one drink.

BIG TIME

Former “Saturday Night Live” star Ana Gasteyer is the guest performer at a concert by unpredictable jazz singer Julian Fleisher and his “Rather Big Band.” Tonight, 7:30 p.m., World Financial Center, Winter Garden, 220 Vesey St. at the West Side Highway, 212-945-2600, free.

UP HIGH, DOWN LOW

Today is National High-Five Day, according to a group of Virginia college students who have managed to spread their enthusiasm for high fives as far as Brooklyn. The hand-slapping holiday is celebrated with music by singer-songwriter Wynn Walent, complimentary cookies, and a video presentation. Even those who don’t attend can celebrate on their own. As organizers envision it, “The sound of the perfect high five resonates, causing those nearby to silently and enviously take notice. You both walk on, and likely relate the story to whomever you eat dinner with that night. There is no reason why this should not happen with alarming frequency.” Tonight, 11 p.m., Galapagos, 70 N. 6th St., between Kent and Wythe avenues, Williamsburg, Brooklyn, 718-782-5188, free.

COMPLEX CONCERT

The complete song cycle of English composer Brian Ferneyhoug h’s “Carceri d’Invenzione” receives its American premiere. Ensemble 21 performs the piece, which is a series of pieces for small orchestra and soloists. Michael Adelson and Alan Pierson conduct the ensemble, featuring soloists soprano Tony Arnold, piccolo player David Fedele,flutist Mario Caroli, and violinist Mark Menzies. Tomorrow, 7 p.m. talk, 8 p.m. concert, Columbia University, Miller Theatre, 2960 Broadway at 116th Street, 212-854-7799, $20 general, $12 students.

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