His Sonatas and a Duet for two claviers attest his ability as a composer.
"Johann Sebastian Bach"
Johann Nikolaus Forkel and Charles Sanford Terry
4. 282 There are, in fact, three Concertos for two claviers and Orchestra: two in C minor and one in C major.
"Johann Sebastian Bach"
Johann Nikolaus Forkel and Charles Sanford Terry
3 Concertos for 2 claviers.
"Story-Lives of Great Musicians"
Francis Jameson Rowbotham