Possible Clues:

• Key with no sharps or flats
• Key with all white notes
• Key of Beethoven's 'Für Elise'
• Key of Mendelssohn's Symphony No. 3
• Key related to C
• Concerto key
• Composer's key
• Key signature with no sharps or flats
• ''Inconvenience'' preceder
• Former dictator presented with gold key