Blue is a standout track from A Perfect Circle's 2004 compilation album, aMOTION. The song exemplifies the band's signature alternative metal and progressive rock sound, characterized by Maynard James Keenan's emotive vocals and Billy Howerdel's intricate guitar work. As part of a collection that bridges the gap between their debut and sophomore studio efforts, the recording captures the group's evolving sonic landscape during a pivotal era. The track showcases the dynamic interplay between heavy instrumentation and melodic sensibilities that defined their early discography. While often grouped with other non-album singles and remixes, Blue remains a compelling song in their catalogue, reflecting the atmospheric depth and emotional resonance that fans associate with the band's broader body of work.