Possible Clues:

• Johann Strauss work
• What's excessive about French father over a piece of music?
• 'The Mikado', e.g.
• Father abroad in occupational therapy volunteers for light work
• To repeat, is involved in light entertainment
• Characters in a treetop in trouble -- one has song and dance
• 'The Mikado,' for one
• ''The Mikado'', for one
• Gilbert and Sullivan offering
• Gilbert and Sullivan production