The Inventions No. 1, 6, 9, 10 and 11. The violin  voice playes the upper voice of the original, the second voice is  transposed here and there an octave upwards by which the distance to the  violin reduces a bit and the voice does not become thus deep sounding.  Besides, one comes only seldom into thumb position, so that the pieces  are to be mastered also by not yet so far advanced bassists.  Nevertheless, besides, the music itself remains rather demanding.