Stockhausen used borrowed material in several works , notably Gesang der Jünglinge , Telemusik ( 1966 ) , Hymnen ( 1967 ) , and Opus 1970 ( 1970 ) . Hymnen incorporates words and melodies of many different national anthems in a performance combining electronic sounds with voices and instruments . The intention , Stockhausen claimed , was " not to interpret , but to hear familiar , old , preformed musical material with new ears , to penetrate and transform it with a musical consciousness of today . ”