Related Clues:

• Wake-up calls
• Early music - such row and discord
• The early morning air?
• A rousing outdoor performance
• Bird song at daybreak
• Birds singing at daybreak
• Early bird song
• Birdsong
• Arousing songs?
• Early sound of birds
• First light music
• Early music without instrumentation
• Cheep alarm clock?
• In brief half-light, stop to catch first bit of warbling — like this?
• Turned sunward outside chapter house for early morning song