Opera continues to stretch as an artform. How about a “not-so-underground music world that lives the boundary-less, non-hierarchical ethic of communal musicmaking, an ethic that some classical opera composers might hold up as an ideal but have rarely put into practice with any success. ‘Nitrate Hymnal’ is described by the Washington Performing Arts Society as multimedia, interactive, post-punk, hybrid and several other things as well, which adds up to: You have to see it to know what it’s about.”