A close look at texting practices in several 15th-c. MSS supports recent scholarship concerning the performance practice of textless lines in polyphonic music. I-Fn, MSS Banco Rari 230 and 337 supply partial text for lower voices in a manner that suggests that textless vocalization of much or all of the lower parts was a common practice in Northern Italy. Similar texting practices in E-E, MS V.III.24 and GB-Ob, MS Canonici misc.213 indicate a similar practice in Venice and Burgundy.
McGee, Timothy J.
"Singing Without Text,"
Performance Practice Review:
1, Article 8.
Available at: http://scholarship.claremont.edu/ppr/vol6/iss1/8