Amanda Rose Martinez:

One summer at the annual Bremen Music Festival in Germany, Robert Levin, a classical pianist, was in the midst of improvising a passionate and wild cadenza during Beethoven’s “C Major Piano Concerto.” A cadenza is a passage in a concerto during which the orchestra ceases and a soloist strikes out on his own, improvising within the style of the piece. Up until the early nineteenth century, many classical composers wrote space for these cadenzas within their works. Levin is one of a handful of musicians who has taken it upon himself to revive the practice of classical improvisation. He is world renowned for his ability to effortlessly extemporize in the styles of several composers, including Mozart, Beethoven, Schubert and Mendelssohn. In this particular concert, however, Levin had gotten himself into a bit of a pickle.
“I was going whole hog,” Levin said, thanks to the permission Beethoven gave his renderers to modulate or change keys during his cadenzas. “I had gone really far afield and was in F sharp major. That’s as far away from C major as you can possibly get because if you keep going, you start to get closer to the other side.”