"Say Something" is a song by American pop duo A Great Big World from their debut album, Is There Anybody Out There? (2013). Written by the duo members—Ian Axel and Chad King—alongside Mike Campbell, the song was originally recorded by Axel for his solo album This Is the New Year (2011). It was later released as a single by the duo on September 3, 2013, by Epic Records. Following its usage on American reality TV show So You Think You Can Dance, the track gained attention from singer Christina Aguilera, who wanted to collaborate with A Great Big World on the song. Soon afterwards, a re-recorded version of "Say Something" with Aguilera was released on November 4, 2013.

A Great Big World is an American musical duo from New York made up of singer/songwriters Ian Axel and Chad King and signed to Epic Records. The group is best known for their single "This Is the New Year", which was performed by the cast in an episode of Glee and reached the Billboard Mainstream Top 40 chart in May 2013, and their worldwide hit "Say Something", particularly after recording it as a duet collaboration with Christina Aguilera. The duet peaked at number four on the Billboard Hot 100.