Over the course of her solo career, Linda Ronstadt has been understandably wary about her backup groups. For one thing, she felt inadequate- she didn't know how to talk in musical terms, she said and couldn't give effective orders. For another: "Backing up a girl wasn't cool at all. They didn't want to do that. They wanted to be rock & rollers and have this sexual identity they get by being up onstage with their guitars."The extreme example occurred in 1972, when she hired Glenn Frey and Don Henley, now Eagles.