{"value"=>"<p>Letter: [n. p.] to Frédérique Petrides [n. p.] 1959 July 12.</p> <p>Typed letter, signed in ink</p> <p>Says he will probably be at F. P. concert; writes about his conducting engagements; answers F. P. questions about the \"Puerto Rican sketches\"</p> <p>Related names and works: Petrides, Frédérique.</p>"}