The Marriage of the Frog and the Mouse is the earliest version in print of A Frog He Would A-Wooin' Go. It's from 1611, from a book called Melismata: Musical Fancies. It was printed in London. Reference of the song is found even earlier in print in The Complaynt of Scotland (1549).

Notes

I modernized most of the English spelling above.

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Sheet Music

Sheet Music - The Marriage of the Frog and the Mouse