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“Which of the Pickwick Triplets Did It?” was expertly performed by Steve Martin as part of a fictional Broadway musical in the Hulu series’ third season.

The duo won an Emmy on Sunday for “Which of the Pickwick Triplets Did It?” their original song co-written with Marc Shaiman and Scott Wittman for “Only Murders in the Building” at the Creative Arts Emmy Awards.

Proof of musical life: There’s no banjo in sight, but Martin shows off his song-and-dance chops in Season 3’s “Death Rattle” musical by performing the tongue-twisting ditty “Which of the Pickwick Triplets Did It.”

The “guys” were the award-winning Benj Pasek and Justin Paul, who co-wrote the song “Which of the Pickwick Triplets Did It?” for the third season of “Only Murders in the Building.”

For the “Pickwick” patter song, they reached out to Shaiman and Scott Wittman, the theater veterans who musicalized “Hairspray” and “Charlie and the Chocolate Factory” — and who actually gave Pasek and Paul their big break on Season 2 of TV series “Smash” in 2013.