Sean Rafferty 's guest is Louis Lortie , the French-Canadian pianist whose playing has been likened to that of Alfred Cortot and who tomorrow evening begins a seven-concert cycle of the complete Beethoven sonatas at London's Wigmore Hall. Music includes Beethoven's Piano Sonata in G, Op 14 No 2 played by Lortie at
5.35, and Sibellus's Karelia Suite at about 6.40.