Possible Clues:

• Composer airs his gripe with variations
• 'Fountains of Rome' composer
• Composer disgruntled, his gripe gives him away
• Ottorino --, Italian composer 1879-1936
• Ottorino —, composer (The Pines of Rome)
• Italian composer of symphonic poems, d. 1936 — hire pigs (anag)
• Pines of Rome composer
• Italian composer of 'The Fountains of Rome'
• Ottorino --, 1879-1936, Italian composer
• The Pines of Rome composer