The musical legacy of late qawwali singer Nusrat Ali Khan has been passed on to his teenage nephews, Muazzam and Rizwan Ali Khan. Performing as Rizwan-Muazzam Qawwli, the two brothers bring a fresh approach to the religious Sufi music of Pakistan. According to www.worldmusicportal.com, "they use music as a vehicle to enlightenment or to achieve inner knowledge -- via rhythmic hand clapping, percussion, harmonium and a vast repertoire of sung poetry." Reviewing one of their concerts, Escape took a similar view, writing, "the tone continues throughout with the solo and group voc...