Plot: A Spanish Evening Infectious rhythms, sweeping melodies and glittering instrumental colours - the hallmarks of Spanish music - are in abundance in tonight's trilogy of Iberian show-pieces played by the Philharmonia Orchestra leader PETER THOMAS conducted by Serge Baudo with solo Alicia de Larrocha pianist in the impressionistic Nights in the Garden of Spain by Manuel de Falla. The concert opens with the perfect Spanish picture-postcard, Espana by Emmanuel Chabrier , and ends with more music by Falla: the two suites from his ballet The Three-Cornered Hat