This is a traditional sea shanty. Our song starts with:

A-roving, a-roving, since roving’s been my ru-i-in,
I’ll go no more a-roving with you, fair maid.

In Amsterdam there lived a maid,
Mark well what I do say,
In Amsterdam there lived a maid,
Who was always pinching sailors’ pay.
I’ll go no more a-roving with you, fair maid.

A-roving, a-roving, since roving’s been my ru-i-in,
I’ll go no more a-roving with you, fair maid.

I can’t find the rest of the song as we sing it – departs from the original words.