She famously sang that she would "Let the Mystery Be" on her first album back in 1992, but the mystery nowadays about Iris DeMent is whether she has let her songwriting muse be, for good. Her last album came out in 2004; while fellow acoustic-music heroine Gillian Welch broke a similar dry spell with a new record last month, there appears to be no sign of anything forthcoming from DeMent on disc. Good to know, though, that she's still venturing out to perform the first-rate material from her four albums. One new recording did surface last year, when DeMent sang the traditional hymn "Leaning on the Everlasting Arms" over the closing credits of the Coen brothers' True Grit remake. The Museum of Art keenly pairs DeMent with a screening of the film. —Peter Blackstock