Researching Journeys With Beethoven, I was amazed to find famed conductor Lorin Maazel not only using Twitter but taking questions there. So I asked: What's your single favorite movement of a Beethoven piece? His wonderful answer, from Violin Sonata No. 5, also known as the "Spring" sonata, is found below--a surprise, however, since it's not orchestral. But it is one of the great 'Spring' treats.