This site introduces unknown Emanuel Bach (C. P. E. Bach).
C. P. E. Bach Sonata in A Major Wq. 65/37 (H. 174)
1st Movement: Allegro
2nd Movement: Andante ma non troppo
3rd Movement: Allegro di molto
ChatGPT4o writes as follows (please note that it may not be accurate):
Emanuel Bachʼs Sonata in A Major Wq. 65/37 (H. 174) is one of the particularly captivating works among his keyboard music. This sonata demonstrates his innovative style during the transitional period to classical music. The first movement is characterized by lively melodies and rhythmic motion, providing a powerful opening that draws in the audience. The second movement unfolds with a calm and emotionally rich melody, highlighting Bachʼs delicate expressiveness. The final third movement is notable for its fast tempo and energetic passages, bringing the piece to a brilliant conclusion. This sonata embodies Bachʼs unique musical language and his wide range of emotional expression, making it a beloved piece among performers and audiences alike.
According to the commentary by Darrell M. Berg on Miklós Spányi's CD (BIS-CD-1329) (translated by ChatGPT4o):
"The 1st Movement ʼAllegroʼ is distinguished more by its diverse textures and rhythms than by melody. This style foreshadows the works of the later ʼKenner und Liebhaber (Connoisseurs and Amateurs)ʼ series (1779-1787). The 2nd Movement ʼAndante ma non troppoʼ is an aria-like piece with continuous melody and modest accompaniment, belonging to the expressive middle movements that Bach excelled in. The 3rd Movement ʼAllegro di moltoʼ creates a lightness with cheerful melodies and a triplet accompaniment in the left hand. This left-hand broken chord is similar to the ʼAlberti bassʼ form, but Bach rarely used this form and may have spoken of it disparagingly as a ʼclattering Allegro.ʼ
In Bachʼs works, movements with such lively triplets are rare."