Is the transposing the sonata for just the violin? or for both, violin and piano? To transpose depends upon what key you want the sonata to be in. You can transpose it to any minor key, just so that the violin part has reasonable hand positions to facilitate the notes of the sonata. With the violin, you don't what to deal with too many sharps or flats though. How about trying A minor? Just experiment on the violin or piano and see what sounds the sonata sounds the best. I do that a lot with my violin and find that I have to transpose up or down a few whole tones. best wishes, go12_3
lets say you wanted to transcribe Corelli's e minor sonata to solo piano. It was written in the Baroque era thus having baroque tuning. The piece says it is in E Minor but actaully the diatonic harmony is that of D minor. So would the solo piano be in E Minor or D minor?