I'm surprised there's not been mention of Les Barker and his songs on the subjects, sorry, on the rulers. I don't have a full list but I'm sure mudcatters can help:

Bohemian Royalty (Bohemian Rhapsody) in Labrador Rigby

Camilla (Maria, from West Side Story) in Beyond our Cairn

The Lady's on a Stamp (The Lady is a Tramp) in Bark to Front

There are no Guards at Buckingham Palace (They're Changing Guards at Buckingham Palace) in Beagles, Bangles and Beads

Old Queen Mother (Old Man River) in Pekinese up Mother Brown