This is a variation on a Scottish traditional song.

lyrics:

My bonnie lies under the ocean
My bonnie lies under the sea
My bonnie lies under the ocean
Oh, bring back my bonnie to me

Bring back, bring back
Bring back my bonnie to me, to me
Bring back, bring back
Oh, bring back my bonnie to me

My body lies under the ocean
My body lies under the sea
My body lies under the ocean
Now it’s just my bonnie and me