, , .
1920- , ' , 4/5 . . 䳿 , . , 40 , . , , , ͳ, . ϳ 50 . 糿, . 90 .
. , , , . , , , , , .
' ϳ . , ͳ, , 볿 ; 糿, ϳ , , . , 볿 . , .
', , . ' , , - . "International Business Machines" ("IBM"), , , ' . , 9/10 , , ϲ .
"Time-Warner", 1989 , ϲ. 350 , 볿 , , 糿 볿. , , , .
-, , , "Sony", 䳺 "CBS Record", "Hollywood"; "Bertelsmann" "RCA Records" , ϲ, "Hachette".