Possible Clues:

• Not returning to Italy, perhaps, for key
• Pitch a collection of works, overwhelmed by theatre award
• Theater award involving a literary key
• The sum of harmonic relations between notes of a scale
• Character determined by key, in music
• Key heavyweights extremely touchy
• Tiny alto misbehaving is a classical feature of music
• Musical quality
• Use of conventional keys and harmony
• Came down to bring round award for classical music feature