50 renaissance and baroque standards
Inspired by the real books in Jazz, this is a collection of harmonies to improvise on and has an interesting preface with ideas on how to approach early music improvisation (diminution / variation).
A must have for Ground-lovers and ostinato-compulsions.
They also keep a list of addenda online! Look here.
Pascale Boquet and Gérard Rebours
Europe, South American
Type of Thing you Learn
Beginner, (More) Advanced