One of the highly original features of the Spanish Renaissance is the birth of a specific vihuela repertoire. This local instrument, halfway between the lute and the guitar, stimulated a high number of treatises and books of tablatures in which can be found diferencias, some of the earliest forms of variations. Christopher Wilson offers a wide overview of this art, from the famous figures of Narváez and Milán to more underrated composers such as Pisador and Fuenllana.