In Los Angeles, from the early 1960s through the late 1980s, young musicians and singers formed tight-knit musical communities anchored by nightclubs such as the Ash Grove, the Troubadour, and the Palomino. These musicians injected elements of folk, bluegrass, and country to enliven and reinvigorate the sounds of pop and rock. The music flowing from these scenes exerted a lasting influence that would stretch the boundaries and alter the...