The new Deep Purple "Live In London 1974" CD is from an old SQ BBC broadcast. It talks about the quadraphonic broadcast of June 6 1974, and shows a picture of the BBC Transcription album label with SQ written twice on the label in the liner notes. I've had a Mexican EMI album of this show that was released in the early 1980's, but it a single disc and only 60 minutes. This new 2 CD set contains the full 90 minute show as originally broadcast and sounds great through the Tate!