“Aeterna” or “Æterna” is the song Coldplay debuted on March 11, 2023 during their second show in São Paulo, Brazil. It was played as the final part of “The Lightclub” mix, which is a medley of a few remixes of songs, performed by the band while wearing alien-like helmets.

In a January 2023 interview, the band’s vocalist Chris Martin hinted that ‘a new song might be played when the Music of the Spheres world tour resumes’. In the same conversation, he also revealed the title for Coldplay’s tenth record, Moon Music.