Classically trained, Charlie Day plays multiple musical instruments: the violin (which he learnt at just three years old), piano, accordion, guitar, harmonica, and trombone, per Collider. As "It's Always Sunny in Philadelphia" fans know, he also has some impressive pipes. Notably, in the Season 9 episode "The Gang Tries Desperately to Win an Award," Day showcases his versatile singing abilities, alternating between a Randy Newman-esque nasal inflection and a jaw-dropping falsetto before instructing bar patrons to, ahem, vacate the premises.
Day told SlashFilm that, like his zany "Sunny" namesake, his dream is to write a musical (or something musically themed) one day. "I absolutely love just working on music. ... I think the next thing that I write or direct, ideally would have to do with music," he enthused.
Of course, Day's dream materialized to an extent with "The Nightman Cometh," in which his onscreen alter ego pens a musical to impress the (unrequited) love of his life, The Waitress. Though it started out as a Season 4 episode, "The Nightman Cometh" eventually became a stage show that the cast performed, per GQ. Speaking with the outlet, Rob McElhenney disclosed that Day composed most of the music and wrote the majority of the lyrics, too. And while Day admitted that performing the musical in front of a live audience was terrifying, he ultimately had a blast: "It was a glimpse into what it was like to be a rock star for a minute, to have people singing your songs. ... It was an adrenaline rush."
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