"Sober Up" is a song by American alternative pop band AJR, from their second studio album, The Click. Released as the album's third single, it features Rivers Cuomo, lead singer and frontman of American rock band Weezer, although certain radio stations instead play a version with band member Ryan singing Cuomo's verse. "Sober Up" became the first number one song for AJR on the Billboard Alternative Songs, when it peaked at number one on the chart in March 2018. Similarly, Cuomo had his first number one on the alternative Billboard chart as a solo artist.

The inspiration for "Sober Up" came to Jack and Ryan Met during their time at Columbia University, the brothers missing their childhood. Taking inspiration from their feelings of loneliness, they wrote about Jack calling his second grade crush from elementary school.^[1] iHeartRadio describes "Sober Up" as a positive song despite its difficult lyrics.^[2]

Near the end of writing, Rivers Cuomo of Weezer followed AJR on Twitter. The two bands expressed admiration for each other's work, with AJR asking if Cuomo wanted to collaborate with them. Cuomo was sent an unfinished version of the song, to which he wrote and sang the bridge.^[3] Cuomo recorded several versions, including one in Spanish, one that was nonsensical, and the one that was eventually accepted into the final track.^[4]

On January 31, 2018, a music video for "Sober Up" was released. In the music video, the band is walking through New York City while singer Jack Met meets a younger version of himself.^[5]

In March 2018, "Sober Up" peaked at number one on the Billboard Alternative Songs chart and was the first number one song for AJR. For Rivers Cuomo, "Sober Up" was his first song to reach number one on Billboard's Alternative chart as a solo artist outside of Weezer.^[6] The song was additionally picked as iHeartRadio's digital song for October.^[7]

In January 2018, AJR performed "Sober Up" on Jimmy Kimmel Live! alongside their previous hit "Weak".^[8] Cuomo has performed the song with AJR for select shows, additionally covering it for some solo shows.

• List of Billboard number-one alternative singles of the 2010s