So we're in the 50th anniversary of Led Zeppelin, and on this day on 25th September 1968 heralds the inception of the epic Led Zeppelin I album: the moment whereby I would be able to manifest the sounds and layers I had heard in my head and also prove my status as a producer.

The group went to Studio No.1, Olympic Studios, 117 Church Road, Barnes, London, SW13, having extensively rehearsed the material for Led Zeppelin I at my house in Pangbourne and we had had the opportunity to perform a good percentage of that material during a few concerts in Scandinavia and the UK to experience our music in a live situation under the clandestine cloak of the Yardbirds. In those days, the studio time was scattered and limited over a few days in September and October, dictated by Olympic's availability.

Thus, with the aid of my old friend Glyn John's masterful engineering, at 11pm on Wednesday 25th September 1968, we began our recordings and embarked upon committing this eclectic powerhouse to tape.

Much has been speculated about the initial recordings, so I thought it would be useful to show the worksheet from RAK that gives the dates and times that we were scheduled initially to go in. It makes fascinating reading.