Sara Watkins’ solo debut has been a lifetime in the making. The 27-year-old singer-songwriter and fiddle player spent nearly two decades as one-third of Nickel Creek, the Grammy Award–winning acoustic trio. With Nickel Creek on indefinite hiatus, she just released her self-titled solo disc, produced by former Led Zeppelin bassist John Paul Jones. It features an impressively wide range of backing players, including duo Gillian Welch and Dave Rawling, Tom Petty and the Heartbreakers keyboardi...