The fourth instalment of Kristian Bezuidenhout’s Mozart concerto series brings together two works separated by 10 years in the composer’s creative life. The Piano Concerto in B flat K238, composed in 1776 and often numbered as his sixth piano concerto, was in fact Mozart’s second original work in the form – the earliest examples he composed are now reckoned to be arrangements of keyboard sonatas by JC Bach and other composers – while K503 in C major was written a decade later in Vienna.