[2] At the opening of the new Leipzig Opera House, Apreck sang Tigrane in Handel's Radamisto, at his side aming others Hanne-Lore Kuhse, Sigrid Kehl and Bruno Aderhold.
During the years of his Leipzig engagement, he sang all the great roles of his profession such as Max in Der Freischütz, Don José in Carmen, the Emperor in Die Frau ohne Schatten in the legendary production by Joachim Herz as well as Florestan in Fidelio, Bacchus in Ariadne auf Naxos, Riccardo in Un ballo in maschera and Alvaro in La forza del destino.
He sang the tenor part in the premiere of the requiem Deutsches Miserere by Paul Dessau in Leipzig in 1966.
Towards the end of his career he sang character roles in Zimermann's Die wundersame Schustersfrau and in Janáček's The Makropulos Affair.
Apreck had guest appearances at the Staatsoper Unter den Linden and at the Komische Oper Berlin.