The official story of the Greci guitar begins in 1989, when one of these specimens was presented to pope Giovanni Paolo II. The acceptance of the gift was the first recognition of the great cultural significance of this innovation in the field of musical instruments. The specimen is now in the private collection of the Holy Father.

From 1990 to 1997 Michele Greci collaborated with the ENEA, the governmental Ente per le Nuove Tecnologie l'Energia e l'Ambiente, where he had the opportunity to dedicate himself to a research on the movement of the soundboard of guitars and was able to use sophisticated technologies such as laser interferometry. Many guitars of high value were submitted to comparative tests which revealed the superior sound power of the Greci guitar.

This characteristic already stood out in the HOLOGRAPHIES, but an harmonic analysis was still missing. A mechanic device, which substituted the precarious human performance, was necessary so as to obtain objectively valid sound emissions which would give constant and repetitive results. The mechanical device was created, after many attempts, under the direction of prof. Enzo Marchetti, at the Departement of Mechanics and Aeronautics of the Faculty of Engeneering at the university La Sapienza in Rome - Italy.

At the end July 2001 some comparative TESTS were carried out with the mechanical device at the Istituto Elettrotecnico Nazionale "Galileo Ferraris" in Torino. The Institute released a statement to certify the objective phonic and harmonic superiority of the Greci guitar, so confirming the real innovative achievements of the instrument.

These phonic and harmonic achievements mean that the Greci guitar has a volume comparable to that of bowed instruments. These qualities are particularly important in the field of chamber or concerted music, where guitar now appears very much in the background.

A wide use of the Greci guitar should therefore mean the beginning of a new era of great interest for the guitar, which can now compete with other soloist string instruments in all fields of musical composition.