In music, especially Western popular music, a bridge is a contrasting section that prepares for the return of the original material section. In a piece in which the original material or melody is referred to as the "A" section, the bridge may be the third eight-bar phrase in a 32-bar form (the B in AABA), or may be used more loosely in verse-chorus form, or, in a compound AABA form, used as a contrast to a full AABA section.
The bridge is often used to contrast with and prepare for the return of the verse and the chorus. "The b section of the popular song chorus is often called the bridge or release."[2]