"Reason" is a piano-led pop ballad with soft string arrangements and lyrics that talk about reminiscing past memories with a loved one.

An updated version of the song, featuring new vocals, new instrumentation and slightly different lyrics was recorded following the band's announcement of their temporary disbandment in September 2003.

[4] Again produced by Brötzmann and recorded by Trevor Hurst at FM-Studio in Frankfurt,[5] the updated version contains new lyrics and a slightly alternated instrumentation.

[5] Mixing of "Reason" was handled by Jeo, who also played keyboards along with Brötzmann, Werner Becker, and Stefan Hansen.

"[7] Upon its release, "Reason" debuted at number nine on the German Singles Chart in the week of 8 December 2003, becoming the group's tenth top ten entry.