By 1971, Linda Ronstadt was already a local music legend verging on a major breakthrough. To accompany her country-folk rock sound for her brief Silk Purse Tour, Ronstadt’s manager, John Boylan, wanted to assemble a band of fellow country rock musicians. So Boylan reached out to some unknowns: a drummer named Don Henley, two guitarists Glenn Frey and Bernie Leadon, and a bassist named Randy Meisner. For these strangers, the tour was just a tem…