The Rev. Jeff Mosier understands the importance of occasionally re-inventing oneself. Especially when you’ve turned 50 years old, and are suddenly aware that time has become far more precious. “Some people are threatened by starting over,” he says. “Me, I love it. I really do.”
In late 2009, Mosier decided to put Blueground Undergrass — the band he had fronted for more than a decade — on hiatus. That group recorded four albums and built a sizeable following by combining bluegrass purism with...