Septet in E flat major, op.20 for violin, viola, clarnet, horn, basson, violoncello and double bass Septet in E major, op. 20 for clarinet, horn, bassoon, violin, viola, violoncello and double bass Septet in E-flat major,Op.20 for Clarinet,Horn,Bassoon,Violin,Viola,Cello and Double-Bass