Scoring
The work is scored for two cor anglais (English horns), two horns, and strings. The use of the cor anglais in place of the (related, but higher-pitched) oboe is more than unusual; indeed McVeigh (2009:386) suggests that it is "the only symphony in the entire history of the genre to use this scoring". The horns play a prominent role in all but the second movement, and Haydn's choice of E flat major may have been dictated by the fact that the valveless horns of the time sounded best when played as E flat instruments (that is, with E flat crooks inserted).
Read more about this topic: Symphony No. 22 (Haydn)