If you want to understand Beethoven, listen to his piano sonatas. Without them, you’ll never grasp how the same man could write the hummable, easy-listening Septet of 1799 and the scraped dissonances of the 1825 Grosse Fuge, which even today scares Classic FM listeners.

It’s the 32 sonatas, not the nine symphonies or 16 string quartets, that join the dots.