These eight pieces have been selected from a collection of 18th century music for three clarinets. The original title reads: Partia a Tre. The collection consists of thirty short pieces all of them anonymous except for number one in this book. 'Di Rösser' is probably Valentin Roeser clarinettist composer and author of Essai d'instruction l'usage de ceux qui composent pour la clarinette et le cor (1764).