Matt Callahan, resident sound designer at Actors Theatre of Louisville, recently took on the additional task of songwriter. In his conversation with Classical 90.5’s Scott Dowd, he talks about what it was like to write an original song for the play Sirens which is part of the 34th annual Humana Festival of New American Plays. “Sirens” runs through March 28 in the Bingham Theatre at Actors Theatre of Louisville.