Music censorship
Songs are often edited before they're broadcast on any radio or television networks. This is for removing any material that may be classified as objectionable for a number of listeners. The objectionable materials in question include profanity, references to sex, violence and drug abuse/trafficking. This is mainly done to comply with the relevant rule in broadcasting and with the conduct codes. It's also done for making songs more marketable for mainstream audiences. Songs edited for materials within this manner are mainly called clean version songs. Common editing techniques include backmasking, blocking or completely replacing any offensive lyrics with different words.