In Freundschaft, for melody instrument

In Freundschaft (In friendship) is a composition by Karlheinz Stockhausen, number 46 in his catalogue of works. It is a serial composition for a solo instrument, first for clarinet, and later arranged by the composer for many other instruments, often in friendship to specific performers. In Freundschaft was first conceived in 1977 as a birthday present for clarinetist Suzanne Stephens, and was first performed at her birthday party in Aix-en-Provence on 28 July that year in a version for the flute. It was later reprised on other instruments as the composer adapted it to nearly every standard orchestral instrument at the request of performers. The work is an example of formula composition, with a basic motif first being presented and then varied in two contrasting, cyclical layers; interrupted by cadenzas. The work has been recorded multiple times, including under the supervision of its composer.