Classic piece, I recorded the prelude as a demo for the Auenkirche organ. Here again but now together with the fugue.
The BWV 545 was the first real Bach that I was "allowed" to practise (the little ones from BWV 553-560 don't count). I played it then in a service that was supposed to determine my suitability as a substitute organist. So my hands were a bit sweaty when I was playing it the first time in public :D