Other forms: payolas
When a radio station is paid money in exchange for frequently playing a certain song, that's payola. If you bribe your local disc jockey to feature your latest hip hop track on her morning show, it's payola.
Any media exposure that's secretly paid for is considered payola, although it's most common in the music industry. Radio stations can be legally paid to play music, but that has to be made clear during the broadcast — otherwise, it's illegal. The word payola, from "pay off," has been around since the 1930s, and in 1959, the US Senate launched the Congressional Payola Investigations, making payola a legal term (and a misdemeanor).