6 Sonatas, volume 1: Sonatas in G major, E minor and D major
for 2 violas or flute/violin and viola, after the 6 sonatas for flute op.2 (1727)
TWV 40:101, TWV 40:104, TWV 40:102
The two («equal») viola voices correspond to the original flute parts which are octaved downwards. Together with one of the added original voices for flute/violin, several alternative instrumentations are possible.