Hummel´s arrangement of the Piano Concerto in D major, K537, the fifth in the series to appear, was published in 1835. The lead-in (Eingänge) models that he provided are particularly valuable in the case of K537, which is among those concertos for which Mozart left no written-out examples.

Equally importantly, Hummel might well have witnessed the work´s compositional process and first performance, and thus his own contributions could be considered as authoritative.