A bridge is a section that connects different parts of a song or opens up a new view partway through the repetitions. In Japanese pop it is sometimes called the “C melo”. After the verses, pre-chorus and chorus have repeated, it changes the melody and chord progression significantly so the final chorus sounds fresh again.
When a bridge is needed
When simply repeating the same chorus starts to feel monotonous, dropping the energy or moving to different chords in a bridge makes the returning chorus stronger. It is the place to add new information in the second half of a song.
Creating contrast with the chorus
In a bridge you place elements that differ from the chorus: fewer notes, a different rhythm, a different melodic register, or a key change. As well as building to a peak, a common approach is to go quiet and then return to the final chorus.
Changing the chord progression
Writing a flow that differs from your usual chord progression changes the song’s point of view. Try one change at a time: borrow a chord from outside the key, alter the bass movement, or hold chords for longer.
Building one in your DAW
Reserve about eight bars before the final chorus and start from a stripped-down version of the existing parts, which makes it easier to think about. Before writing a new vocal or lead, check whether the accompaniment alone already makes you want to return to the chorus.
How it differs from an interlude
An interlude usually means an instrumental passage between vocal sections, while a bridge refers to a role in the song’s overall structure. Some bridges have vocals; others are instrumental like an interlude.
