Mark Erelli has forged a colorful career by making the art of “being everywhere all the time” seem effortless. It’s hard to think of another artist who seems equally at home serving as a sideman for GRAMMY-winning artists like Paula Cole, Marc Cohn, and Josh Ritter, or producing albums for Lori McKenna, as he does writing and producing his own material, like 2019’s “By Degrees,” on which he was joined by a host of voices including Rosanne Cash and Sheryl Crow, and nominated for Song of the Year at the Americana Honors and Awards.