According to later testimony of Clementi’s student Ludwig Berger, the C major Sonata Op 34 No 1 was originally a concerto (and Op 34 No 2 a symphony). The former, the Sonata in C major, has wide-ranging keyboard figurations, some for the left hand, that would be quite at home in a piano concerto; but the big cadential patterns marking off the exchanges of solo and orchestra are missing. If this was once a concerto, Clementi took pains to conceal these origins. The second movement of the sonata, in F major, is particularly memorable: its atmospheric first section anticipates the manner of Clementi’s student John Field—and ultimately Chopin—to which the high drama of the contrasting middle section in the parallel minor offers an effective foil.
from notes by Leon Plantinga © 2010