Irrlicht, (subtitled "Quadrophonische Symphonie für Orchester und E-Maschinen"; English: Will-o'-the-wisp: Quadraphonic Symphony for Orchestra and Electronic Machines) is the debut solo album by Klaus Schulze, originally released in August 1972 on Ohr Records.

Recorded without synthesizers, Irrlicht's set of "early organ drone experiments" is "not exactly the music for which KS got famous".

Irrlicht's atmospheric drone music tone is similar to Tangerine Dream's album Zeit, released the same year.

"[3] Schulze mainly used a broken and modified electric organ, a recording of a classical orchestra rehearsal, and a damaged amplifier to filter and alter sounds that he mixed on tape into a three-movement symphony.

[3] Irrlicht, despite its highly unconventional nature, was originally released on the krautrock label Ohr.