Bach Fugues ( 4 ) arranged by Christine Potter. If you love fugues, this book is for you ! These duets for two altos are in the original keys, and can of course be played by any two instruments in the same key ( 2 c flutes, bass flutes, 2 piccolos ). Transpositions are included so that the first alto part can be played by c flute, or the second alto part can be played by bass flute.