Possible Clues:

• Young bird and seal mentioned
• Sound of seal and young swan
• One of the children of Lir perhaps produced The Ring we hear
• A child of the pen
• Young bird that's cold still round garden's borders
• Ugly duckling catching small seal
• Tiny trumpeter
• Sexless city gent choreographed ballet role
• It's not part of city gent's choreographed minor ballet role
• Little swan