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Toccata for organ in Charles Marie Widor's symphony
Ans.2: A more general answer would be "movement".
one organ
There are many but the form that comes to mind is the toccata.
Whooty by eDubb
There are many composers who wrote a 'toccata in D minor' . Probably the most famous is the Toccata and Fugue in D Minor, BWV 565 by JS Bach.