Bowery Ballroom
This legendary theater with art deco accents is probably the city's top midsize concert venue. Packing in the crowds here is a rite of passage for musicians (some already big; some on the cusp of stardom). Grab one of the tables on the balcony (if you can), stand (and get sandwiched) on the main floor, or retreat to the comfortable bar in the basement, which fills up after each show.