I Bet You They Won't Play This Song on the Radio

Okay kiddo, sometimes musicians create songs that have lyrics or messages that are not appropriate for everyone to hear on the radio. That's why there is a rule that radio stations can't play certain songs if they have bad language, talk about inappropriate things, or go against certain values. So, "I bet you they won't play this song on the radio" means that the singer thinks their song won't be played on the radio because it might not fit with the radio station's rules.