Contemplative riffs with a slow-building intensity are the mark of the five-piece instrumental post-rock band Portrait of a Drowned Man. Guitarists Paul Connolly and Justin Kervina have shared the stage for more than 15 years. Fellow guitarist Aaron Richner has been with them on the front and back end, but spent 2006 to 2014 out of the lineup. Ken Nyberg has held down the sticks for a half-dozen years running. C.J. Keller is more than a year into a stint on bass. Portrait of a Drowned Man has released three studio albums and several live recordings, and has written scores for three different movies.