Alfred Masterwork Edition - Edited by Palmer. This authoritative edition of all 15 of Bach's 3-Part Inventions, also known as Sinfonias, has been painstakingly compiled from two definitive 'autographs' (original handwritten copies), one, a music instruction book partially in the hand of both J.S. Bach and his son Wilhelm Friedemann,le of tempo indications appears at the end of the book.