One Direction Sings the Alphabet With Bert From 'Sesame Street' (Video)

 Richard Termine/2014 Sesame Workshop

It's a rite of passage for every rock star … an appearance on Sesame Street.

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The Backstreet Boys sang "One Small Voice" with Elmo, while Justin Bieber (as a Muppet) joined Elmo to croon "Measure" in a recording studio. Other musical artists to guest-star on the show include Johnny Cash (singing "Nasty Dan" with Oscar), Ray Charles (on the alphabet song), Feist (singing her "1234"), the Goo Goo Dolls (performing "Pride"), India.Arie (singing the ABCs with Elmo), Bruno Mars, R.E.M. (singing the song "Funny, Happy Monsters") and Stevie Wonder, among many others. 

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More recently, One Direction's Liam Payne and Harry Styles ran through their ABCs with Bert just to make sure they were on point, but not without a little hesitation. Especially after Bert called Liam out for almost forgetting the lyrics, because, you know, sometimes your forget what comes after W and X.

Watch it below.

This article originally appeared on Billboard.com.

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