A New York City club that offers cover-free live music seven days a week is a find. One that also features bar-top belly dancers, 20-piece whistle shows, and impromptu West African sing-a-longs is rare indeed. Zebulon Cafe Concert (www.zebuloncafeconcert.com) flung open its doors a year ago on a quiet stretch of Wythe Avenue in Williamsburg, abutted by an empty lot and a motorcycle repair shop. Before 10 p.m., it is just a charming, unassuming cafe serving cheese plates and pates and spinning old jazz records (the sleeves of classic recordings adorn one wall). At night it becomes a destination for music lovers from all over the city.

Zebulon, located at 258 Wythe Avenue between Metropolitan and North Third Street, deftly mixes jazz veterans with exuberant ethnic acts. “What we like is festive music,” says Guillaume Blestel, an affable Frenchman who, along with co-owner Jef Soubiran, lives upstairs from the bar. “This is not music that aims for perfection.” Musicians are encouraged not only to put on a show, but to trade energies with the crowd; with no established set times, the pace of each night takes on its own organic rhythm.

The club is small and the stage cramped, so when the bar sponsors its fast-becoming-legendary “Tubapalooza” jamborees – Dixieland meets Klezmer meets Balkan brass – horn players wend their way around dancing patrons while a belly dancer leads impromptu conga lines. During the raucous “mutant salsa” sets of Zemog, El Gallo Bueno, bartenders pick up spoons and clank out their own beats on hard-liquor bottles. Check the schedule at zebuloncafeconcert.com and make sure to give generously when the musicians’ basket is passed around.

Zebulon is named for a character from a French cartoon show that Mr. Blestel and Mr. Soubiran watched as kids. “It’s a little wink, a constant reminder to cultivate your inner child,” Mr. Blestel says, winking. “You never want to become blasé.”