Radio sweeper

A radio sweeper is a short, pre-recorded sample used by radio stations as segues 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, radio imaging, sweeps, station imaging, stingers, IDs, promos, shotguns, voice overs, and intros.