The treatise Nuova inventione d’intavolatura, per sonare li balletti sopra la chitarra spagniuola (“A newly invented tablature for playing balletti on the Spanish guitar”), published in 1606 by Girolamo Montesardo, radically revolutionized the way to write and perform guitar music. For the first time, an extremely practical guitar notation was proposed: the alphabet. It consisted in the correspondence between any chord, whether major or minor, and a letter.