The Missa Salisburgensis à 53 voci is, perhaps, the most large-scale piece of extant sacred Baroque music, an archetypical work of the Colossal Baroque. The author of this work is anonymous, however, recent studies of the work suggest that is almost certainly the work of Heinrich Ignaz Franz von Biber. Until recently, this Mass has been considered to have been a composition of Orazio Benevoli, or, more likely, Andreas Hofer, Biber's close contemporary and associate. The attribution to Biber is now universally accepted. The sole manuscript source narrowly escaped being used by a greengrocer to wrap vegetables for sale in the 19th century. The work is scored for very large forces and is polychoral in structure.