The Gavotte from J.S. Bach's suite No. 6 for baroque cello, BWV 1012, performed by William Skeen on an original five-string baroque cello . HD video from the Voices of Music Great Artists Series, San Francisco, 2011. The late-17th century Italian cello in this video, in original condition, is one of the rarest of instruments that survives from the baroque period. Less than ten such instruments remain, and less than five from the late 17th century--rarer than Stradivarius violins. The five string cello was very popular in the baroque period, and a number of important works make use of the extended upper register of the instrument, including Bach's sixth cello suite.