"Sober Up" is the third single from AJR's second studio album The Click and features Weezer frontman Rivers Cuomo, although some radio stations play a version with AJR's Ryan singing Cuomo's part. "Sober Up" became the first number one song for AJR when it peaked at number one on the Billboard Alternative Songs chart in March 2018. Similarly, Cuomo had his first number one on the alternative Billboard chart as a solo artist.
AJR had written most of "Sober Up" before reaching out to Rivers Cuomo of Weezer. After following AJR on Twitter, the band as well as Cuomo expressed admiration for each other's work, in which they later asked if he wanted to collaborate with them. Cuomo was sent an unfinished version of the song that was missing a bridge. To complete "Sober Up", Cuomo wrote and sang the bridge. Cuomo had 3 versions: one in Spanish, one that was nonsensical, and the one that was eventually accepted into the final track.