A heldentenor, earlier called tenorbariton, is an operatic tenor voice, most often associated with Wagnerian repertoire.

Wozzeck is the first opera by the Austrian composer Alban Berg. Composed between 1914 and 1922, it premiered in 1925. It is based on the drama Woyzeck, which German playwright Georg Büchner left incomplete at his death. Berg attended the first production in Vienna of Büchner's play on 5 May 1914, and knew at once that he wanted to base an opera on it. From the fragments of unordered scenes left by Büchner, Berg selected 15 to form a compact structure of three acts with five scenes each. He adapted the libretto himself, retaining "the essential character of the play, with its many short scenes, its abrupt and sometimes brutal language, and its stark, if haunted, realism..."