Complex sentence: The Birotron also appears on two Tangerine Dream albums: "Force Majeure" (featuring the male choir and violin sounds throughout the album), and "Hyperborea" showcasing the male choir sound again.
Split into simpler sentences: The Birotron also appears on two Tangerine Dream albums: "Force Majeure"-featuring the male choir and violin sounds throughout the album. The second known appearance is on "Hyperborea" showcasing the male choir sound again.