Mario Castelnuovo-Tedesco composed 52 Greeting Cards for various instruments between 1953 and 1967, collectively catalogued as opus 170, which he developed in a non-systematic manner up to the year before his death. These pieces were conceived as gifts for his interpreters and students, whom the author meant to gratify with these pleasant little vignettes. The 21 Greeting Cards for guitar, written from 1954 to 1967, are here collected for the first time. Historical introduction and critical commentary in Italian and English.