EVERY weekday evening, cars all shapes and sizes screech to a halt in a narrow lane in Delhi's posh Panchsheel Enclave. People, all shapes and sizes, spill out to the soft strains of the gracious waltz wafting from a two-storied building. In a flurry of sarees, dupattas, business suits and stuffy ties, they rush down the steep stairs to the brightly-lit basement, as the music changes to a perky polka. For there's a pirouette party on every evening from 8 to 10, where corporate executives young, middling and old, housewives and business professionals, doctors and ad persons dance the day's stress away to foot-tapping music.