[The Conversation Africa] The overthrow of Ethiopian emperor Haile Selassie in 1974 led to violent conflict that had a particularly heavy impact on musicians. Sing and Sing On: Sentinel Musicians and the Making of the Ethiopian American Diaspora is the first study of the forced migration of musicians out of the Horn of Africa dating from the revolution. The book traces their struggles and what happened to their rich and diverse music traditions when they settled in the US. Ethnomusicologist Kay Kaufman Shelemay talks about her book