Duets 1-30 are all one-page or less in length and duets 31-50 are all two pages in length. As the book progresses, there are more difficult key and time signatures, more challenging technique and in the later duets some cadenzas.
There is a wide variety of styles and forms throughout the book. The final six duets are arrangements of concertos and sonatas originally written for the alto trombone (the top part containing the original part), including works by Albrechtsberger, Fux, Wagenseil and Michael Haydn. -the publisher