Bumper music
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Bumper music is a term used in the radio broadcasting industry to refer to short clips of music used to buffer transitions between programming elements. Bumper music is commonly employed when a syndicated program takes a break for local station identification or "goes to commercial."
Bumper music was first used heavily by Rush Limbaugh, who pioneered conservative AM talk radio in the United States. Extended news programs aired on non-commercial radio networks such as NPR also use short clips of music between stories and features, but these are known as buttons.