Perger's attempt at figuring out the chronology is, however, so full of mistakes (including the attribution to Haydn of music by others) that later musicologists, instead of trying to amend the catalog (as they have with Köchel's) have created new ones from scratch.
Even so, Perger's catalog is still widely used by libraries, music publishing houses and some record companies.
33 long after the rest of the symphony, Perger mixed this minuet up with the free-standing pieces.
Hieronymus Graf von Colloredo commissioned Haydn to write six duos for violin and viola.
The set of six was presented as all Haydn's, and Colloredo was unable to "detect in them Mozart's obvious workmanship.