Linda Ormiston introduces the fourth of five programmes featuring performances given last week at the St Magnus Festival. Music includes Haydn's Piano Sonata in Eflat, HXVI53, played by John Lill , Schnittke's Sonata in the Old Style performed by Priya Mitchell (violin) and Robert Kulek (piano), and chamber music from Psappha and the English Baroque Soloists. Plus a dip into mythical Orkney lore in A Johnmas Foy.