Possible Clues:

• Dear person who encourages Swiss composer
• French-born composer Arthur ____’s best-known work is Pacific 231, an orchestral portrait of a steam engine
• Composer's hard on Jamaican music -- tossed over without hint of acceptance
• Arthur --, French composer, one of Les Six
• Athur —, Swiss composer
• Flight which would carry publicity for Rex Warner book
• Honourable incitor of Les Six