London’s Broadwood pianos, sonorous and strong, influenced the symphonic sweep of Haydn’s Piano Sonata in C. The work’s thematic concentration and audacious humour complement the restless lyricism of Beethoven’s Op. 109. Mozart styled his Piano Sonata in C K545 as a ‘little piano sonata for beginners’. He completed his elegant work in June 1788, on the same day as he finished his Symphony No. 39.