Radio sweeper

Radio sweepers are used by radio stations as a links between songs that give listeners a brief station identifier or promo, generally 20 seconds or less: "You're listening to the soft sounds of [NAME] radio. Easy listening throughout the Bay area."

Dry radio sweepers are voice only -- no music or sound effects.

Sweepers are also known as liners, bumpers, sweeps, station imaging, stingers, IDs, promos, shotguns, voiceovers, and intros.