I started this thread nearly 10 years ago. In my last post I lamented an apparent extension of the change in my key perception. Today I have to acknowledge that some things have not changed at all over this period. Listening to the peerless second movement of Beethoven’s first piano concerto in one of my favourite keys, A flat major, I was aware that I was hearing it with no suggestion of a key shift. The roundness of A flat major was there from beginning to end. The dialogue in this key between the first clarinet and piano was serene. The wonderful full sound of a dominant sevenths and big chords that Beethoven gives to the left hand of the pianist were there in all their fullness. Pre-lapsarian bliss!