Matthias Michael Beckmann is the first cellist to perform the entire cello literature on a 5-string cello.
MMB: "As far as I'm concerned, the fifth string simply belongs to the cello. This is my personal opinion. I can only assume why there was no further development of the 5-string instrument. The cello was originally intended only for basso continuo, but then it was liberated and also given melodies to play. Then came the Bach suites, and Boccherini, with his fanciful, galant, virtuoso music. There, as I see it, the development stopped. I think that in 20 years there will be a great many 5-string cellos, and in 50 years that will be the norm."