Sean Rafferty with arts news, music and guests, including the prize-winning 24-year-old composer Oscar Bettison, whose latest commission, Hour Tree, is premiered at St John's Smith Square on Wednesday. Music includes at 5.45 Mozart's Rondo in D for piano and orchestra, K382 played by Murray Perahia and the English Chamber Orchestra; at 6.05 Matthias's Let the People Praise Thee, O
Lord sung by Christ Church Cathedral Choir conducted by Stephen Darlington with organist Simon Lawford; and at 6.45 Poulenc's Flute Sonata played by Jennifer Stinton with pianist Scott Mitchell.