Friedrich Melchior, Baron von Grimm was a German-born French-language journalist, art critic, diplomat and contributor to the Encyclopédie ou Dictionnaire raisonné des sciences, des arts et des métiers. In 1765 Grimm wrote Poème lyrique, an influential article for the Encyclopédie on lyric and opera librettos. Like Christoph Willibald Gluck and Ranieri de' Calzabigi, Grimm became interested in opera reform. According to Martin Fontius, a German literary theorist, "sooner or later a book entitled The Aesthetic Ideas of Grimm will have to be written."

Christoph Willibald Gluck was a composer of Italian and French opera in the early classical period. Born in the Upper Palatinate and raised in Bohemia, both part of the Holy Roman Empire, he gained prominence at the Habsburg court at Vienna. There he brought about the practical reform of opera's dramaturgical practices for which many intellectuals had been campaigning. With a series of radical new works in the 1760s, among them Orfeo ed Euridice and Alceste, he broke the stranglehold that Metastasian opera seria had enjoyed for much of the century. Gluck introduced more drama by using orchestral recitative and cutting the usually long da capo aria. His later operas have half the length of a typical baroque opera.