Beginning an evening of programmes broadcast from the East Church in Kirkwall, Orkney, celebrating the 21st St Magnus Festival. From now until 11.30, there will be live music, poetry, interviews and archive recordings capturing the character of this unique festival. `In Tune' is presented by Linda Ormiston, with guests Kathryn Stott, the Yggdrasil Quartet of Aberdeen, composer Marc Yeats and festival poet Kenneth White. Including Grieg: String Quartet No 1 in G minor (3rd mvt). Yggdrasil Quartet. 6.30 Bach: Concerto in A, BWV1055. Simon Standage (violin), David Reichenberg (oboe), English Concert/Trevor Pinnock.