According to Wikipedia, Frog Went a-Courtin' is an English language folk song. Its first known appearance is in Wedderburn's Complaynt of Scotland (1549) under the name "The Frog cam to the Myl dur", though this is in Scots rather than English. There is a reference in the London Company of Stationers' Register of 1580 to "A Moste Strange Weddinge of the Frogge and the Mouse." There are many texts of the ballad; however the oldest known musical version is found in Thomas Ravenscroft's Melismata in 1611.
I like Pete Seger's version the best. Sing along now:
A frog went a-courtin' and he did ride, M-hm, M-hm.
A frog went a-courtin' and he did ride,
Sword and pistol by his side, M-hm, M-hm.
He rode up to Miss Mousie's door, M-hm, M-hm,
He rode up to Miss Mousie's door,
Where he'd often been before, M-hm, M-hm.
He said, "Miss Mouse, are you within?" M-hm, M-hm,
He said, "Miss Mouse, are you within?"
"Yes, kind sir, I sit and spin." M-hm, M-hm.
He took Miss Mouse upon his knee, M-hm, M-hm,
He took Miss Mouse upon his knee
Said "Miss Mouse, will you marry me?" M-hm, M-hm.
"Without my Uncle Rat's consent, M-hm, M-hm,
Without my Uncle Rat's consent
I wouldn't marry the President." M-hm, M-hm.
Uncle Rat, he laughed and shook his fat sides, M-hm, M-hm,
Uncle Rat, he laughed and shook his fat sides
To think his niece would be a bride, M-hm, M-hm.
Then Uncle Rat rode off to town, M-hm, M-hm,
Then Uncle Rat rode off to town
To buy his niece a wedding gown, M-hm, M-hm.
"Oh, where will the wedding supper be?" M-hm, M-hm,
"Oh where will the wedding supper be?"
"Way down yonder in the hollow tree." M-hm, M-hm.
The first to come was the little white moth, M-hm, M-hm,
The first to come was the little white moth
She spread out the tablecloth, M-hm, M-hm.
The next to come was the bumblebee, M-hm, M-hm,
The next to come was the bumblebee
Played the fiddle upon his knee, M-hm, M-hm.
The next to come was a little flea, M-hm, M-hm,
The next to come was a little flea
Danced a jig with the bumblebee, M-hm, M-hm.
The next to come was Missus Cow, M-hm, M-hm,
The next to come was Missus Cow
Tried to dance but didn't know how, M-hm, M-hm.
Now Mister Frog was dressed in green, M-hm, M-hm,
Now Mister Frog was dressed in green
Sweet Miss Mouse looked like a queen, M-hm, M-hm.
In slowly walked the Parson Rook, M-hm, M-hm,
In slowly walked the Parson Rook
Under his arm he carried a book, M-hm, M-hm.
They all gathered round the lucky pair, M-hm, M-hm,
They all gathered round the lucky pair
Singing, dancing everywhere, M-hm, M-hm.
Then Frog and Mouse went off to France, M-hm, M-hm,
Then Frog and Mouse went off to France
That's the end of my romance, M-hm, M-hm.