 Stockhausen began to compose in earnest only during his third year at the conservatory ( Kurtz 1992 , 26 – 27 ) . His early student compositions remained out of the public eye until , in 1971 , he published Chöre für Doris , Drei Lieder for alto voice and chamber orchestra , Choral for a cappella choir ( all three from 1950 ) , and a Sonatine for Violin and Piano ( 1951 ) ( Maconie 1990 , 5 – 6 , 11 ) . 
