Studie I (1953), Studie II (1954), Gesang Der J (1956) and Zyklus fzwei Schlagzeugern (1960). Performed by David Tudor, Christoph Caskel, Gottfried Michael Koenig and Stockhausen. "A collection of Stockhausen' s most important works from the 1950s, particularly Gesang der Junglinge ('Song of the Youths') 1955-56, probably the most iconic piece of electronic music ever written. Only because of Stockhausen's complete understanding of electronic equipment, along with his creative genius, was he able to produce this masterwork, the first piece of music to unify vocals and electronics."