Hallie will be singing, I'll be playing the Baroque guitar. (We don't have the little Renaissance guitar as pictured for Hallie, but her birthday's coming up. I can't find one on the ebay, though.) Chris Verrette and Edwin Huizinga will be 'adapting in real time' (ie. improvising around) certain stock ground basses of the early 17th century after various examples for ritornellos between the verses of the songs. Every instrumental collection has a few of these grounds in.
Claudio Monteverdi (1567-1643) - Eri gia tutta mia - Ritornellos on Bergamasca (famous from Ancient Airs and Dances by Respighi)
Alessandro Grandi (1586-1630) - Gioite, danzate, ridete - Ritornellos on Folia (an older 'alla Italiana version, not the Folies d'Espagna that Corelli, Marais and Rachmaninov set.)
Stefano Landi (1587-1639) Odi glorie - Ritornellos on Romanesca (the changes from the second half of
Greensleeves. This song's on the birth of Bacchus, who was born in Phrygia and Hallie notes it's in the Phrygian mode.)
Giulio Caccini (1551-1618) - Dalla porta d'Oriente - Ritornellos on the ground Ruggiero (Probably most famous from Byrd's keyboard version)
Giovanni Felice Sances (c. 1600-1679) - Cantata A Voce Sopra La Passacaglia - Ritornellos on the passacaglia (the four descending notes of Hit the Road Jack, the last bit of Stairway to Heaven and many others)
Sances - Cantata a voce sola sopra la Ciaccona - Ritornellos on the ciaccona (which Monteverdi's Zefiro Torna is possibly the most famous version of)