Inspired to a large degree by Opera, Baroque composers such as Vivaldi, Telemann, Purcell and ultimately Bach and Handel began exploring and, exploiting and expanding on these new forms of orchestral music, as well as instrumental chamber music - sonatas, trios, fantasias, variations, etc. etc. etc.
Getting back to Venice, it was the place werewhere large scale, commercial public Opera performances came into their own, during the Baroque era. See: Opera -Baroque era