You’d think that supplying acts like the Dixie Chicks, Sara Evans and Rascal Flatts with blockbuster singles would keep Marcus Hummon fairly well occupied. Not so. He’s also spent the past decade-and-a-half writing and scoring plays, several of them historical or socially conscious in theme, like “Atlanta” (a Civil War story) and “American Duet” (which ponders civil rights). Of course, Hummon is also an artist in his own right. The fact that his label deal fell apart after just one album hasn’t kept him from recording his own. His versions of “Cowboy Take Me Away,” “Born to Fly” and “Bless the Broken Road” on last year’s Rosanna have much more stripped-down arrangements and — with his tawny tenor and conversational delivery — a more intimate, singer-songwriterly vibe than the versions that got all that radio airplay. An impressive bunch of work, and to think he’s also married to Magdalene House founder — and White House honoree — Becca Stevens.