What is the meaning of song called by Coldplay?

"Song for Someone", originally titled "Only Superstition", is a song recorded and released by the British rock band Coldplay for their seventh studio album, A Head Full of Dreams (2015). The song was released as the sixth and final single from the album on 2 November 2016, and was the last song from A Head Full of Dreams to have a music video made.

The lyrics in the song talk about a person who has lost someone important to them, and the journey of learning to live with that loss. The overall tone of the song is one of hope, as it explores the idea that love and memories of the person can help to carry you through difficult times.