Chaconne, from Partita No. 2, BWV 1004, for Violin, Viola and Violoncello
last movement from the 2. Solopartita original for violin alone http://music-learning.net/work-info/88/Bach%20J.s./chaconne-from-partita-no-2-bwv-1004-for-violin-viola-and-violoncello