This site introduces unknown Emanuel Bach (C. P. E. Bach).
C. P. E. バッハ 鍵盤協奏曲 ニ長調 Wq. 18 (H. 421)
1st Movement: Allegro
2nd Movement: Andante
3rd Movement: Allegro di molto
ChatGPT4o writes as follows (please note that it may not be accurate):
Emanuel Bachʼs Keyboard Concerto Wq. 18 (H. 421) in D major is a work composed around 1745, belonging to his Berlin period, and is one of his bright and splendid concertos. It consists of three movements, with the first movement presenting a grand theme, where the keyboard instrument and orchestra engage in intricate dialogue. Based on sonata form, the movement is invigorated by rhythmic innovations and tonal contrasts. The second movement is a slow movement characteristic of the empfindsamer Stil, centered around a lyrical and emotionally rich melody, highlighting an inner beauty. The final movement unfolds lively and rhythmical music based on rondo form, with the keyboard instrumentʼs virtuosic passages being a highlight. This concerto is an important work that demonstrates Emanuel Bachʼs mature compositional technique and the transition to Classical music, offering a brilliant and approachable content that appeals to both performers and audiences. It is a piece where technique and expressiveness are harmoniously balanced.
According to the commentary by Jane R. Stevens on Miklós Spányi's CD (BIS-CD-767) (translated by ChatGPT4o):
In works H. 409 [Wq. 6] (1740) and H. 421 [Wq. 18] (1745), the soloist significantly gains individuality through various means. In the fast movements of these concertos, the string themes are somewhat uniform and impersonal, but the solo keyboard instrument quickly establishes its own individuality by presenting its own themes or transforming the tutti material to create unique music. Additionally, in the slow movements, the soloist further clarifies its individuality by overlaying its music on the reprise of the opening theme by the strings. In these two works, the composer introduces what might be called "psychological complexity," where two conscious musical personalities confront each other and ultimately establish some form of cooperative relationship.