A viola is a stringed musical instrument that looks like a slightly larger violin and produces a rich, warm sound that's lower in pitch than a violin but higher than a cello. When an orchestra plays, the violas often provide the middle harmonies that help blend the high violins with the low cellos and basses.

The viola is played the same way as a violin: you hold it under your chin and draw a bow across its strings, or pluck the strings with your fingers. But because it's bigger, it creates deeper, mellower tones. Some people say the viola's sound is like a human voice, warm and emotional.

Many famous composers loved writing music for the viola because of its unique sound. In a string quartet, the viola player sits between the violins and cello, creating musical bridges that tie everything together. While violins often get the melody and soloists get the spotlight, viola players do essential work that makes the whole ensemble sound complete and balanced. Players like William Primrose and Yuri Bashmet have shown just how beautiful and expressive the viola can be as a solo instrument, too.