List of compositions by Michael Haydn

The numbering in parentheses starting with the capital letter P refers to Perger catalogue.

All of Michael Haydn's symphonies have at least 2 oboes, 2 bassoons, 2 horns and strings (first and second violins, violas and basses, but no cellos).

[2] Hieronymus Graf von Colloredo commissioned Haydn to write six duos for violin and viola.

Haydn fell ill after completing the fourth, so he asked Mozart to write the other two (K. 423 and K. 424).

The set of six was presented as all Haydn's, and Colloredo was unable to "detect in them Mozart's obvious workmanship.