Description on Youtube:
ANTONIO VIVALDI (1678-1741)
Trio sonata for two violins and basso continuo (Variations on "La Follia") Op. 1 No. 12 RV63
Performed by Hesperion XXI
Conducted by Jordi Savall
*"La Folia" is one of the oldest European musical themes. This chord progression has been put to music many times by composers such as Arcangelo Corelli, C.P.E. Bach, Antonio Vivaldi, Allesandro Scarlatti, and Marin Marais.
http://www.folias.nl/html1.html
P.S: I know I already posted this piece being performed by the Purcell Quartet, but the Hesperion XXI version is very exciting to listen to and takes a different perspective on this pice although being perhaps more "liberal" in it's interpretation.