<Ul> <Li> The string quintet is a string quartet augmented by a fifth string instrument . Mozart employed two violas in his string quintets, while Schubert's string quintet utilized two cellos . Boccherini wrote a few quintets with a double bass as the fifth instrument . </Li> <Li> The string trio has one violin, a viola, and a cello . </Li> <Li> The piano quintet is a string quartet with an added piano . </Li> <Li> The piano quartet is a string quartet with one of the violins replaced by a piano . </Li> <Li> The clarinet quintet is a string quartet with an added clarinet, such as those by Mozart and Brahms . </Li> <Li> The string sextet contains two each of violins, violas and cellos . Brahms, for example, wrote two string sextets . </Li> </Ul> <Li> The string quintet is a string quartet augmented by a fifth string instrument . Mozart employed two violas in his string quintets, while Schubert's string quintet utilized two cellos . Boccherini wrote a few quintets with a double bass as the fifth instrument . </Li> <Li> The string trio has one violin, a viola, and a cello . </Li> <Li> The piano quintet is a string quartet with an added piano . </Li>

A work for string quartet in the classical era