The Opus Series offers the intermediate pianist a fresh source of repertoire from the great composers. It includes masterworks originally composed for orchestra, concerto, opera or chamber ensemble. Unlike other transcriptions or thematic arrangements, the Opus Series editions are meticulously faithful to the original work, and true to its melody, counterpoint and harmony. The Opus Series: An incredible source of great music for the pianist looking for new pieces. The Bach and Schubert collections include a CD of recordings of each piece.