There's a term in musical composition called a Coda. Merriam-Webster defines it as "an ending part of a piece of music or a work of literature or drama that is separate from the earlier parts" -- that seems pretty accurate. Though the term was originally coined to describe ending passages in classical compositions, it rose to prominence again in the late 1960s and early 70s when the long-player album format began allowing for longer pieces of recorded music. Many of our more famous Codas are powerful upbeat climaxes -- think "Station to Station" by the late-great David Bowie or "The Chain" by the later-iteration Fleetwood Mac.