Quaternaglia Guitar Quartet (QGQ) is widely acclaimed as one of the top contemporary classical guitar ensembles. QGQ is known for their artistic excellence and for their contributions to the expansion of the guitar quartet repertoire. Over the past nineteen years, the ensemble of Brazilian guitarists Chrystian Dozza, Fabio Ramazzina, Thiago Abdalla and Sidney Molina, has established a broad canon of original pieces and bold arrangements, in which various Brazilian composers, including Egberto Gismonti, Almeida Prado, Paulo Bellinati, Sérgio Molina and Paulo Tiné, have collaborated with the quartet.

The quartet's performance first attracted the attention of the international critics in 1998, after it was awarded the Ensemble Prize at the International Guitar Contest of Havana. According to the critics of the Los Angeles Times, "an aura of purity pervaded the concert of the Brazilian guitar quartet...[it]...met all the requirements with equanimity and intelligence in its California debut."

Quaternaglia's discography includes the albums Quaternaglia, Antique, Forrobodó, Presença and Estampas as well as Quaternaglia's DVD recorded live. In 2008 Quaternaglia made the Brazilian premiere of Gismontiana, a concerto for four guitars and orchestra written by Leo Brouwer and conducted by the composer himself in his first visit to the country.

The musicians of Quaternaglia Guitar Quartet utilize three six-string guitars and one seven-string guitar custom-made by the renowned Brazilian guitar maker Sérgio Abreu.