This site introduces unknown Emanuel Bach (C. P. E. Bach).
C. P. E. Bach Sonata in F Major Wq. 62-9
1st Movement: Allegretto
2nd Movement: Andante
3rd Movement: Vivace
ChatGPT4o writes as follows (please note that it may not be accurate):
Carl Philipp Emanuel Bachʼs Sonata in F Major Wq. 62-9 is one of the particularly captivating works among his keyboard music. This sonata demonstrates his mature compositional technique and is an important piece during the transitional period to Classical music. The first movement has a lively and bright atmosphere, captivating the audience. The following second movement is characterized by a calm and emotionally rich melody, possessing deep expressiveness. The final third movement is a vibrant and energetic finale, with impressive technical passages. This sonata is a fine example of Emanuel Bachʼs unique style and how he bridged the Baroque and Classical periods.
According to the commentary by Darrell M. Berg on Miklós Spányi's CD (BIS-CD-1189) (translated by ChatGPT4o):
"This was the first work Bach contributed to an anthology, published six years after its composition in 1755 as the first volume of the ʼŒuvres Méléesʼ series. This series included keyboard sonatas by German and Austrian composers and was published almost annually until 1765. The first movement ʼAllegrettoʼ of this sonata has a refined and calm atmosphere, devoid of the instability elements Bach often favored. The syncopated notes appearing in the first measure seem to play a thematic role, but in reality, the group of four sixteenth notes contained in this measure is more important as the theme. This movement maintains consistent rhythmic activity, with groups of ʼsighsʼ inserted only at major structural breaks. The second movement ʼAndanteʼ is in D minor and triple meter, featuring a singing melody that includes emphasized slow notes frequently appearing on the second beat, giving it the character of a sarabande. In the third movement ʼVivace,ʼ syncopation becomes more prominent, and this movement is also filled with ʼsighs.ʼ"