"On Blue" is a song by the American rock band The Smashing Pumpkins. It is featured on their 2020 album titled Cyr. The song showcases the band's signature sound, blending alternative rock with electronic elements, and highlights themes of longing and introspection. The track is characterized by its atmospheric instrumentation and emotive lyrics. Billy Corgan, the band's frontman, delivers a haunting vocal performance that complements the song's reflective mood. "On Blue" contributes to the overall narrative of the album, which explores various emotional landscapes and experiences.