Chaconne n. (Mus.) An old Spanish dance in moderate three-four measure, like the Passacaglia, which is slower. Both are used by classical composers as themes for variations.
... then because he wanted to see what I could do in the way of gymnastics. He laughed when I had finished, and patted my shoulder, and said, "Very good acrobatics. Now we will do no more of them. We will apply ourselves to real music." And he said I was to play him what I could of the Bach Chaconne. ... — Christine • Alice Cholmondeley