This is Tangerine Dream’s first four, pre-sequencer, OHR-label releases: "Electronic Meditation", "Alpha Centauri", "Zeit" and "Atem" packaged in replica card sleeves and also includes a poster. Some of this is, imo, some of their finest work.
"Electronic Meditation was recorded in Berlin in October 1969 and featured the first Tangerine Dream line-up of Edgar Froese (guitars, organ, tapes, sound effects), Klaus Schulze (drums, percussion) and Conrad Schnitzler (cello, violin, typewriter)...