ディートリヒ・フィッシャー＝ディースカウ
Kupfer received regular singing lessons from the age of 10, and studied singing with Helga Forner at the Musikhochschule Leipzig. He attended master classes with the likes of Aldo Baldin, Theo Adam and Elio Battaglia, and was taught by Dietrich Fischer-Dieskau and Elisabeth Schwarzkopf.