Chances are very good you've never visited Nawal's homeland. The singer/songwriter hails from the Comoros Islands, which are in the southern Indian ocean snug between the island country of Madagascar and the African continent. Nawal, who was born at the time her home islands were a French colony, is steeped in Western forms of music, but she also plays the gambusi, the sound of which is similar to that of the oud. Hear a fresh and unique folk sound Sunday at 7 p.m. at the Cayuga Vault in Santa Cruz. Details: 421-9471 or www.zookbeat.com.