Sylvia Wright was the daughter of Austin Tappan Wright, who wrote Islandia. "The Death of Lady Mondegreen" first appeared in an article in the New Yorker around 1951?. Later it was collected in her book Get Away From Me With Those Christmas Gifts, which should be available on Abe if you want to read a whoppin' funny article.
I don't have the book any more, but I still recall one of the other mondegreens:
Round John Virgin, who appears in Silent Night right next to the mother and child. The Donzerly Light, from the second line of the National Ant Theme, illuminating all those flags, rockets, bombs and all those other bits of ordnance we Americans can't wean ourselves off.
And I don't know if anybody mentioned it yet, but my mother used to love an early animal friend, Gladly, the Crosseyed Bear. She also remembered one of the old Spoonerisms: I am not as drunk as some thinkle may peep, which also appears in other variants. Ours was a punning family, we lived by this stuff. Maybe that's why my mind is so unhinged today.
I'll have to google that mondegreen site. Yes, as someone said earlier, Lady Mondegreen didn't die alongside of Earl Amoray. She was just very, very sick.