Sonata in A major This is the sonata that Bach transcribed for harpsichord in his violin sonata BWV 1025, and it is one of Weiss' most difficult. Performed by Robert Barto at the Lute Society of America's summer seminar, June 2010 in Cleveland OH. I have posted videos of me playing this piece both solo and with the violin part. To those kind but misguided souls who make the occasional comment that "you play so well, you play better than Barto!" hopefully you can fully understand why my vehement disagreement is not false modesty.