One of these had a particular three-part or ternary pattern attributed to J. S. Bach’s son, Carl Philipp Emanuel Bach (1714–1788), which is now called sonata form.

Key Concepts: rise of piano, standardisation of the orchestra, sonata form, chamber music, symphony, balance, enlightenment, absolute music, concerto, homophonic.

There were some abnormal logical contradiction and theoretical mistakes on the naming and classifying the variant sonata form and rondo type in the Forms of Instrumental Music by Weiner Leo.