A little more detail on the above song by following the link in the article:

This song was resurrected by a folk band called Muckrum Wakes from the oral memories of the East Midlands, and shows the frequent fusion of pagan and Christian traditions at feast days.

And I sing it every year at this time, to commemorate the importance of the spring festival, to the chagrin of the rest of the family.

Apparently it was called The May Song (click). Not currently available online to listen to sadly as best as I can find.