Carl Maria von Weber's achievements as a composer were considerable and influential, demonstrating new possibilities in opera and orchestration, particularly in the handling of wind instruments. His attractive, lyrical style is ideal for the making of arrangements, and the impressive and beautifully proportioned Flute Sonata is a virtuoso masterpiece, as is the operatic Grand Duo Concertant. There is a feeling of solemnity in the G minor Trio, an unusual work with an enigma at it's heart: the song-like Schafer's Klage or 'Shepherd's lament'- the origins of which remain a source of conjecture.