 Stockhausen , along with John Cage , is one of the few avant @-@ garde composers to have succeeded in penetrating the popular consciousness ( Anon . 2007b ; Broyles 2004 ; Hewett 2007 ) . The Beatles included his face on the cover of Sgt. Pepper 's Lonely Hearts Club Band ( Guy and Llewelyn @-@ Jones 2004 , 111 ) . This reflects his influence on the band 's own avant @-@ garde experiments as well as the general fame and notoriety he had achieved by that time ( 1967 ) . In particular , " A Day in the Life " ( 1967 ) and " Revolution 9 " ( 1968 ) were influenced by Stockhausen 's electronic music ( Aldgate , Chapman , and Marwick 2000 , 146 ; MacDonald 1995 , 233 – 34 ) . Stockhausen 's name , and the perceived strangeness and supposed unlistenability of his music , was even a punchline in cartoons , as documented on a page on the official Stockhausen web site ( Stockhausen Cartoons ) . Perhaps the most caustic remark about Stockhausen was attributed to Sir Thomas Beecham . Asked " Have you heard any Stockhausen ? " , he is alleged to have replied , " No , but I believe I have trodden in some " ( Lebrecht 1983 , 334 , annotated on 366 : " Apocryphal ; source unknown " ) . 
