The theorbo is a plucked stringed instrument, a big lute invented in Italy at the end of the sixteenth century. The theorbo was used for both basso continuo and as a solo instrument. It was also used for singing accompaniment. In the eighteenth century, in France, we used especially the accompanying theorbo, very imposing instrument. The theorems disappeared during the eighteenth century, before reappearing in the twentieth century with the renewal of the interpretation of early music on period instruments.