Jascha Heifetz plays Bach's Chaconne from Partita no.2 for solo violin BWV 1004. Johannes Brahms, in a letter to Clara Schumann wrote, "On one stave, for a small instrument, the man writes a whole world of the deepest thoughts and most powerful feelings. If I imagined that I could have created, even conceived the piece, I am quite certain that the excess of excitement and earth-shattering experience would have driven me out of my mind."