BBC Radio 3 Piano Masterclass: 'Sooner or Later - the Poetry of the Piano': David Owen Norris explores how to make melodies expressive on the piano, by changing the time.

In the film, David Owen Norris introduces the topic and works with the following performers and repertoire: Sophie Lythgoe (Mendelssohn: Rondo Capriccioso); Stephen Gearry (Chopin: Fantaisie Impromptu); Emmanuel Vass (Beethoven: 'Moonlight Sonata'); Cathy Liu (Mendelssohn: Song Without Words, Book 6, Op 67, No 5); and Elizabeth Caddy (Mendelssohn: Song Without Words, Book 1, Op 19b, No 4).