A Zona Rosa nightlife stable, b lounge is a loud bar with deep sofas and a balcony that is packed with locals and visitors on the weekend; the pick-up scene here is far from subtle. B lounge is known for its impassioned karaoke party every Wednesday (which also happens to be Ladies Night), which morphs into Latin pop musical medleys later in the evening. On the weekends, it’s electronica, hardcore dancing, and a less chatty vibe.