The theorbo is a stringed musical instrument that belongs to the lute family. It features a long neck and a large body, with two sets of strings: a series of shorter strings for melody and a longer set for bass notes. The theorbo was popular during the late Renaissance and Baroque periods, often used in early music ensembles and opera. Typically played with a plectrum or fingers, the theorbo produces a rich, resonant sound. Its unique design allows for a wide range of musical expression, making it a favored instrument among composers like Giovanni Battista Pergolesi and Claudio Monteverdi.