 In 2004 he commissioned modern harpsichord music by English composer John Webb , whose Surge ( 2004 ) " is built up over an implacable rhythmic repeat @-@ figure . Though neither is explicitly tonal , each skilfully avoids the merely percussive effect that the harpsichord 's complex overtones can all too easily impart to more densely dissonant music . " He has also played the same composer 's Ebb ( 2000 ) , which " comprises a spasmodic discourse against a manic background of descending scale patterns like a kind of out @-@ of @-@ kilter change @-@ ringing " . 
