He was a member of European opera houses, finally the Deutsche Oper Berlin, and appeared as a guest internationally.
Born in Buchs, St. Gallen, Lagger first studied the piano at the conservatory of Zürich, then at the Wiener Musikakademie and in Italy.
At the Salzburg Festival, he performed Bartolo in Mozart's Le nozze di Figaro from 1963 to 1964,[3][4] and Banco in Verdi's Macbeth in 1964.
[1][5] Lagger appeared as a guest also at the Vienna State Opera[6] as well as in Munich, Paris, Lyon, Rio de Janeiro, Warsaw, Naples, Aix-en-Provence, Lucerne, Orange and Madrid.
Lagger's brother (born 1938), who worked under the stage name Alexander Malta, made a career as a bass-baritone, mainly at the Bavarian State Opera and the Staatstheater Stuttgart.