This is a rare CD from Pink Floyd which gives an insight into the band before they got a record deal. The CD showcases 2 tracks (both over 10 minutes long) which are Interstellar Overdrive and a track called "Nick's Boogie". The latter includes sections which would later come up on the track "A Saucerful Of Secrets". Both are instrumental songs and were originally recorded for a film about "swinging london". The sound quality of the tracks is actually surprisingly good considering it's from 66/67. However I haven't given it 5 stars because I feel it's too short with only 2 tracks on. Also included on the CD is a full length video of Interstellar Overdrive which perhaps questions why anyone would buy the more expensive DVD...anyway the video is of reasonably quality and there are also videos of interviews with Mick Jagger and Michael Caine. So yes this CD is a good insight into the psychedelic period of pink floyd's music but I'd wait until you've bought up all of the other floyd albums before you buy this