Ace Records continues its quest to offer variations on a theme by exploring country interpretations of the music of Bruce Springsteen. Springsteen’s Country will collect 20 covers of The Boss, some familiar (Johnny Cash’s “Johnny 99,” Steve Earle’s live take on “State Trooper”), some offbeat (a take on Tunnel of Love opener “Ain’t Got You” by Solomon Burke, the Nitty Gritty Dirt Band’s version of beloved outtake “From Small Things (Big Things One Day Come)”), and some altogether lesser known (Americana acts like Lera Lynn and The Whiskey Treaty Roadshow interpreting “Fire” and…