"Air on the G String" is a famous piece of music by composer Johann Sebastian Bach. It is an arrangement of the second movement from his Orchestral Suite No. 3 in D major, BWV 1068. The piece is known for its serene and flowing melody, often played on the violin. The title refers to the practice of playing the melody on the G string of the violin, which produces a warm and rich sound. This work has become popular in various settings, including weddings and classical music concerts, showcasing Bach's mastery of melody and harmony.