What is a radio bumper? Often referred to as bumper music, podcast bumper or simply bumpers. It's one of the most confused terms in jingles as jingle companies often bundle the word 'bumper' in amongst the words sweepers, jingles and IDs. Radio stations in the USA would use radio bumper music to pad out commercial breaks when they are taking a network show and don't have enough commercials to fill the designated commercial breaks. The music is often a signature theme or logo music. Commercial bumpers, however, are announcements made by the show host or voice over.