The works which are certainly best known and most responsible for Trabaci’s success in modern times are his two collections of instrumental pieces. The title page of the first, published in Naples by Costantino Vitale in 1603, bears the heading Ricercate, Canzone franzese, Capricci, Canti fermi, Gagliarde, Partite diverse, Toccate, Durezze, Ligature, Consonanze Stravaganti, et un Madrigale Passeggiato nel fine. Opere tutte da sonare, a quattro voci. Di Gio. Maria Trabaci, Organista nella Regia Cappella di Palazzo in Napoli. Novamente da lui composto, & dato In luce. Libro Primo. The dedication draws us away from the austere position of the liturgical organist in order to shed light on the unquestionably important role played by the composer and his vocal works in the musical culture of the Neapolitan aristocracy.