Could your Sunday afternoon use a little buzz from, say, an electric violin concerto? In Hamer Hall this month the Australian Chamber Orchestra's Artistic Director Richard Tognetti plays his favourite Mozart Violin Concerto, No.3., on his favourite violin, a 1743 Guarneri del Gésu. (He has recorded all five, available on CD and iTunes.) But he'll also play a new six-string Violectra in a recently commissioned work from Melburnian Brett Dean, arguably the Australian composer best known overseas since his 2009 win of the Grawemeyer Award, the world's richest composition prize. Expect some dazzling contrasts.