Prosecution for payola in the 1950s was in part a reaction of the traditional music establishment against newcomers. The emergence of hit radio had become a threat to the wages of song-pluggers and publisher's revenue streams. By the mid-1940s, three-quarters of the records produced in the United States went into jukeboxes. Attempts were made to link all payola to rock-and-roll music. In the 1950s, independent record companies or music publishers frequently used payola to promote rock and roll on American radio. This practice promoted cultural diversity because disc jockeys (DJs) were less inclined to indulge their own personal and racial biases.