Possible Clues:

• Start of a musical series
• Tune from ''The Sound of Music''
• Tonic Sol-fa song
• 'The Sound of Music' hit
• Notes that are almost as easy as A, B, C
• Mazuma
• Steps on a music scale
• Scale sequence
• Diana swallows more stew - it's bound to be reflected on the scales
• Perform with band associated with one show tune