It used to be thought that Willaert invented double-choir music, drawing his inspiration from the famous organ galleries in San Marco. That his Salmi spezzati were not unique or even innovatory is now beyond dispute. His predecessors and contemporaries working in other important churches of the Veneto — Albertis in Santa Maria Maggiore, Bergamo, Ruffino and Passetto in Padua Cathedral and the Basilica del Santo, Santacroce in Treviso Cathedral — contributed to a significant regional repertory of double-choir psalms, many of which are more adventurous in their use of the medium than those of Willaert. Ruffino extended the use of double-choir to the ordinary of the mass.