This is a collection of four previously released Vivaldi recordings from Christopher Hogwood and the Academy of Ancient Music:
* 12 Concertos, Op.3 - "L'estro armonico"
* 12 Violin Concertos, Op.4 - "La stravaganza"
* 12 Concertos, Op.8 - "Il Cimento dell' Armonia e dell' Inventione" (which includes the Four Seasons)
* 12 Violin Concertos, Op.9 - "La cetra"
I greatly enjoy the AAM's performances of Vivaldi and this collection seems like excellent value for a 48 concerto set.