The German tenor, Walter Asiegel, had already received early intensive musical training in the Knabenchor des Kölner Doms, and he continued with a singing studies at the Musikhochschule Köln.
In musical theater productions of the Hochschule Köln, he was heard in operas by Bruch, Bononcini, Weil and Mozart, as well as in the musical Dara und Gomo. In 2003, he sang Monostatos in Mozart's Die Zauberflöte as a guest at the Theater der Stadt Solingen. He was in the ensemble of the Schlossoper Hallwyl and in 2007 sang the role of Addolf in Offenbach's The Bandits at the Operettenbühne Möriken. In 2009, he sang Camille de Rossillion in Lehar's Lustiger Witwe at the Stadttheater Sursee.
In addition to his busy concert schedule as a soloist, Walter Siegel is also a member of the Schweizer Kammerchor and, since 2008, the vocal leader of the professional vocal ensemble Schola Seconda Pratica directed by Rudolf Lutz.