Piano Concertos Wq.23 / Wq.112/1 / Wq.31 is a collection of piano concertos by Carl Philipp Emanuel Bach, composed in the mid-18th century. The music exemplifies the empfindsamer Stil and the early Classical keyboard concerto idiom, featuring expressive, rhetorically charged solo lines, frequent dynamic contrasts and conversational interplay between the keyboard and orchestra that marks a transition in C.P.E. Bach's output from Baroque conventions toward Classical forms.