The passamezzo moderno, or Gregory Walker was "one of the most popular harmonic formulae in the Renaissance period, divid[ing] into two complementary strains thus:" For example, in C major the progression is as follows: The progression or ground bass, the major mode variation of the passamezzo antico, originated in Italian and French dance music during the first half of the 16th century, where it was often used with a contrasting progression or section known as ripresi. Wikipedia