Italian violinist and composer. In 1684, he cofounded The Musical Brotherhood in Lucca. He served as Director of music in the local palace between 1688 and 1692. Gregori was the first to use the term "concerto grosso" in a set of 10 compositions published in Lucca in 1698. He also wrote two theoretical works, Il canto fermo in pratica (1697) and Il principianti di musica (1735).