Linda Ronstadt began as the clear-voiced, country-influenced singer for '60s folk-rockers the Stone Poneys, where she covered tunes by the likes of Mike Nesmith and Tim Buckley. That knack for choosing material served her well in the second half of the '70s, when she became a pop superstar interpreting songs by everyone from Dave Edmunds and Elvis Costello to Chuck Berry and Roy Orbison. Subsequently, she has shown her diversity by cutting albums of jazz standards, traditional Mexican music, and pure country.