At the start of a three-hour concert in India in 2011, led by sarod master Amjad Ali Khan with his sons Amaan and Ayaan, the master of ceremony puts it politely: "Ladies and gentlemen, may I kindly request you to silence your mobile phones?" The request was important not only because, as one of his country's most popular musicians, Ali Khan demands great respect, but also because his music is both trance and vortex. The droning tones of the instrument his family claims to have invented are an overwhelming narcotic wave, but the melodies and rhythms are incredibly active, lashing about and percolating with the enthusiasm and inquisitiveness of a wild animal emerging from a season of dormancy. Simply put, Ali Khan's music creates a world of sound, complete with the din of the day and the surprises of life; there's no room for distractions. FRIDAY, FEB. 1, AT DUKE'S PAGE AUDITORIUM. $10–$42/8 p.m.