(({author))}. "[(({url))} (({title))}]" (subscription required). Grove Music Online in Oxford Music Online. Retrieved on (({accessdate))}.

This template should be substituted!
Example usage: ((subst:User:TwilligToves/CiteGroveOnline |author=author |title=title |url=url |accessdate=((subst:CURRENTMONTHNAME)) ((subst:CURRENTDAY)), ((subst:CURRENTYEAR)) ))