Writer/composer Mason Emmert sings, plays, arranges, music-directs, and otherwise oversees musical storytelling across media. Photo: Ryan Nava Media, 2021 In 2017, Mason’s undergraduate thesis, Three Psalms, a four-movement work for SATB unaccompanied choir, premiered at Haverford College. The following spring, he composed an original score for Bryn Mawr College’s production of Mr Burns: a post-electric…