"Lalala" is a song by American producer Y2K and Canadian rapper bbno$, released as a single on June 7, 2019, by Columbia Records. The music video was released on August 21, 2019.
The song became viral on the media sharing platform TikTok due to its catchline: "Did I really just forget that melody?"
To promote the release of the song, Y2K and bbno$ created fake stories about how they met and made the song, sending them to blogs including Lyrical Lemonade. A remix version featuring Spanish singer Enrique Iglesias and Canadian singer Carly Rae Jepsen was released on October 30, 2019.
The official video of the song was released on August 20, 2019, on Y2K's YouTube channel. The video takes place in a studio set designed to look like a children's educational show. As the video progresses, both artists begin using the different objects from the kids' show to illustrate the song, like a puppet theatre, different wallpaper and studio spaces, and a globe to point at locations.
Carl Lamarre of Billboard called the track a "fun-filled tune" with bbno$'s "outlandish" rapping over the "Latin-tinged record".
It is the first song to chart for either of the duo, debuting at number 84 on the US Billboard Hot 100 before peaking at number 55. On March 17, 2023, the song was certified triple platinum by the Recording Industry Association of America for equivalent sales of 3,000,000 units in the United States.