|Single by Dillon Francis featuring T-Pain & Lay Lay|
|from the album The Lego Movie 2: The Second Part Original Motion Picture Soundtrack|
|Released||January 18, 2019|
"Catchy Song" is the main theme song to the 2019 Warner Bros. Pictures film The Lego Movie 2: The Second Part. It is written by Jon Lajoie, produced by Dillon Francis, and sung by T-Pain and Lay Lay (the latter credited on the soundtrack release as That Girl Lay Lay).
The song is notable for its repeated lyric, "This song's gonna get stuck inside your... (3x) ...head!"
Following the same attempt to create an earworm of a song with "Everything Is Awesome" from The Lego Movie, the producers of the film created the similar song for the sequel, which principally features the repeated phrase "This song's gonna get stuck inside your head!" for most of the song. According to Lajoie, he found that "Everything is Awesome" was "annoyingly catchy", and the only way that they could outdo that was "Dial the 'annoying' up to 11!".
The first use of the song in The Lego Movie 2: The Second Part is in a scene in which most of the film's characters are subjected to the song and all except Lucy dance to it, while simultaneously the denizens of Harmony Town sing it to Emmet and Rex. Lucy/Wildstyle avoids being "brainwashed" by the song by breaking one of the speakers and using some of its pieces to build earmuffs for herself before escaping via air ducts, while Emmet and Rex escape in a similar fashion.
The song is briefly sampled in the unhappy reprise of "Everything Is Awesome" ("Everything's Not Awesome") when Lucy proclaims that the song is "gonna get stuck inside your heart", a proclamation made to bring back the hope of defeating Rex and restoring harmony.
The song also plays in its entirety in the credits after Super Cool.