As the arguments become violent, Chatto grabs her longboard and skates into town where she ends up at a laundromat. The video follows Clean Bandit's Grace Chatto and a "lover", actor George Todd McLachlan as they argue. The music video was released on, starring the members of Clean Bandit and Demi Lovato. Clean Bandit performed the song during their set at the Capital FM Summertime Ball along with Lovato as a special guest on 9 June 2018. The song was added to the set list of the European leg of Lovato's Tell Me You Love Me World Tour.
It additionally peaked at number one in Austria, the Czech Republic, Finland, Germany, Hungary, Ireland, Israel, Lithuania, Poland, Russia, Serbia, Slovakia and Swiss Romandy, as well as the top ten in Australia, Belgium, Croatia, Denmark, France, Greece, Latvia, Lebanon, Norway, Portugal, Romania, Scotland, Singapore, Slovenia, Sweden, and Switzerland. In Australia, the song has reached number 7, giving Clean Bandit their fourth and Lovato their second top 10 entry in the country. "Solo" reached number one in the United Kingdom, becoming Clean Bandit's fourth UK chart-topper and Lovato's first number-one song in the nation. The chorus consists of a mix of synth and vocoder effects, and it bears a resemblance to Rita Ora's " Anywhere". Described as a "summer anthem", it opens with a "buoyant production". It is performed in the key of B minor in common time with a tempo of 105 beats per minute, following a progression of Bm–A–F ♯m–G and Bm–A–D–G, and Lovato's vocals span from A 3 to D 5. "Solo" is an upbeat EDM song about self-love in spite of a heartbreak. You know when the connection is bad and the speed fluctuates? We couldn't hear that well, but it turned out really well." Composition She was in Alabama in a studio and we were over here. She also revealed that the song was recorded over FaceTime because the band was unable to schedule a studio session with Lovato.
Grace Chatto of Clean Bandit told the London Evening Standard that "Solo" was based on her own experience with a "difficult break-up". Camille Purcell also disclosed in a tweet that she has been involved in the making of "Solo". Clean Bandit teased the song on, writing on Instagram and Twitter: "Really excited to announce our new single Solo with Demi Lovato will be out 18/05." The announcement came with the song's cover art.
The song was first revealed when a dancer posted on her Instagram Stories that she was starring in a Clean Bandit and Demi Lovato music video.