There was a recording of two of Beethoven’s violin sonatas on the BBC Radio3 website. I was in the mood for some chamber music. The first one was No 2 in A major. Given the trend in my key sense in recent months, I was not surprised that it was in B flat for me from the start. As I do not know this Sonata, I thought it would be simplest to think of it as Beethoven’s Violin Sonata in B flat major. Happy. Sorted. Content.

So why did the 3rd movement sound in A major from start to finish? Never a suggestion of an upward shift. All the character of that key. I could follow the harmonies. Solid.

Same recording. Same performers. Same piano.

What had changed?