Alasdair Clayre reflects on Rudolf Wittkower 's re-discovery of Renaissance theories about architecture and its relation to music. With contributions from SIR ERNST GOMBRICH, SIR DENYS LASDUN , SAM CARTER , IAN FENLON , ANDREW PARROTT , ROGER SCRUTON and MARGOT WITTKOWER. Reader GABRIEL WOOLF Producer JUDITH BUMPUS