Kaitlin Olson – a non-singer who can carry a tune surprisingly well, though her execution is inconsistent, with a tendency to come (”Frank’s Little Beauties”) and go (”The Gang Turns Black,” the live version of “The Nightman Cometh”)
Glenn Howerton – a trained singer who’s out of practice and who thus can be wildly impressive in short bursts (”The Gang Gets Quarantined,” ”The Gang Turns Black”) but whose voice was very obviously shot to hell after several months of live touring and barely survived the filmed version of “The Nightman Cometh: Live!”
Danny DeVito – a non-singer with an innate sense of rhythm and a willingness to practice and learn, which makes him a solidly dependable musical performer as long as he’s given the right music (”The Nightman Cometh,” “The Gang Turns Black”)
Rob McElhenney – a non-singer. Period. Sorry, Rob. We love you anyway.
Charlie Day – not a singer, per se, but something even better: a musician, with perfect pitch, who can make his voice do anything at all. His lack of specific vocal training is evident in his singing, but it’s hard to dwell on this when he’s, say, hitting and sustaining a high C for two whole bars (rehearsal footage for “The Nightman Cometh,” “The Gang Tries Desperately to Win an Award”), or whipping out a harmonica for a long solo and then switching immediately back into belting with perfect breath control (”The Nightman Cometh: Live!”). His singing ability is all the more astonishing for how lightly he carries it: does he even know how good he is? If Glenn Howerton could play the harmonica, Dennis would be whipping out the harmonica every other episode and we’d never hear the end of it; whereas Charlie does it only in “The Nightman Cometh: Live!” and plays it off as a goofy joke rather than a hidden talent he’s been sitting on for years. What else is he secretly capable of? May we all take such vanity-free joy in our natural abilities as Charlie Day.