Famous Sufi singer Amjad Sabri was shot dead in Pakistan on June 22 in an attack claimed by Islamic extremists.Amjad Sabri and his late father, Ghulam Farid Sabri, were well-known qawwali singers, a style of music rooted in Sufism, or Islamic mysticism. They carried on a family tradition that goes back to the 17th century, when their ancestors performed for the Mughal emperors who ruled much of the Indian subcontinent.Islamic extremists have targeted Sufis in the past and destroyed their shrines, accusing them of promoting idolatry. A splinter faction of the Pakistani Taliban said it killed Amjad Sabri because he was a "blasphemer."