A ubiquitous accompaniment technique since the 16th century, and a faithful witness to the evolution of harmonic language up to the 19th century, basso continuo is an essential skill for keyboardists in the context of accompaniment, and for non-keyboardists an indispensable approach to the early repertoire. In this course, basso continuo will be studied at the keyboard (harpsichord, organ, fortepiano), in the light of historical sources (methods, exercises).