Here’s another keyboard delight from C.P.E. Bach, this time a live concert performance by pianist Marc-André Hamelin, he of the ferocious talent, and seemingly limitless repertoire and musical curiosity. Check out the transition into the second movement at c. 6:00, where in the words of one of the YouTube commenters, “Dad walked in.” And another reminder of what I find so appealing about J.S.’s second son: How he, in the words of German musicologist Roman Hinke, “disregards all calls for an evenly balanced symmetry.”