The Klavierstücke constitute a series of nineteen compositions by German composer Karlheinz Stockhausen.
Karlheinz Stockhausen lecturing on Klavierstück XI at Darmstadt, July 1957
Programme for the world premiere of Klavierstück IX
The Teatro Regio in Turin, where Klavierstück XIII was premiered
Klavierstück XV was premiered in the Museum Ludwig (Cologne Cathedral in the background)
Marcelle Mercenier was a Belgian pianist and teacher.
Marcelle Mercenier at home, around 1980