Don’t confuse (former West-) German composer Walter Zimmermann, born in 1949, with (former East-) German composer Udo Zimmermann, 6 years his elder, whose most famous work is his Chamber opera Die weisse Rose after the German resistants brother and sister Hans & Sophie Scholl – and of course nobody a bit cognisant in 20th-century music would confuse either with Bernd Alois Zimmermann (links will open new tabs to Wikipedia entries). Walter is a minimalist composer. He is represented in my collection only through a very minor piece, the very short but fascinating Die Postkarte, a folksong arrangement part of an homage to Berio, performed by Johanna Knauf and Ensemble Musica ‘900 conducted by Maurizio Dini Ciacci on Folk Songs (with works of Betty Olivero, Andrea Mascagni, Carlo Galante, Zygmunt Krauze, Virgilio Savona, Salvatore Sciarrino, Claudio Ambrosini, Andrej Petrov, Luca Francesconi, Hubert Stuppner) on Dischi Ricordi CRMCD 1009 (1989).