The sonatas and partitas for solo violin (BWV 1001–1006) are a set of six works composed by Johann Sebastian Bach. They are sometimes referred to in English as the sonatas and for solo violin in accordance with Bach's headings in the autograph manuscript: "Partia" (plural "Partien") was commonly used in German-speaking regions during Bach's time, whereas the Italian "partita" was introduced to this set in the 1879 Bach Gesellschaft edition, having become standard by that time. The set consists of three sonatas da chiesa in four movements and three partitas (or partias) in dance-form movements. The 2nd Partita is widely known for its Chaconne, considered one of the most masterly and expressive works ever written for solo violin.