The LIFT- MUSICALLY
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Unlike a bridge which often goes in a brand new direction musically, the lift tends to stay in a similar musical "tone" as the verse.
The chord progression of a lift usually flows seamlessly from the verse to the chorus but is still different enough to signal to the listener that the song is moving to the chorus.
For example: If the verse of a song played back and forth from G to D during the verse, and the chorus started on a C, the lift might come in on an Am to a D before starting the chorus on C. That movement to the Am triggers a signal that the chord progression is coming to a change and allows the progression to move smoothly to the first chord (C) of the chorus.