The instrumental development in a song or piece of music. Most commonly at the start, instruments will slowly be introduced the more the song/piece goes on.

First pioneered by the composers of the Mannheim orchestra some time in the late 19th century the musical discovery has been used a lot in pop, rock, classical and other music genres.
"The song starts with a Mannheim development and then gets into the main melody."
by ScissorCut April 18, 2020
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