I have a different version, which may or may not be of interest. "Hal and Tow" is simply "Heel and Toe," the dance form, in a slightly older English, no need to spell it "Tow," and "rumbelow" is no nonsense, it is a place name from Anglo-Saxon, and is an evolution of the place-specified surname of the 12th c. Richard de Thrimelowe. [Olde English pre 7th Century "threom", a derivative of "threo", three, and "hlawum", the dative plural of "hlaw", barrow, tumulus, burial mound; hence, "at the three tumuli". Source: http://www.surnamedb.com/surname.aspx?name=Rumbelow, or in SCAdian heraldry, http://heraldry.sca.org/laurel/names/misplacednamesbyname.htm it means "by the three mounds or barrows"]. In any case, on to the song:

===

CH:
Hal and Toe (clap), jolly rumbelow, (2 claps)
we were up (clap), long before the day-o, (slow it down a bit)
to welcome in the summer, to welcome in the May, O,
Summer is a-comin' on and winter's gone away, O.

Take no scorn to wear the horn,
It was the crest 'ere you were born.
Your father's father wore it and
your father wore it too, O.

> CH

Robin Hood and Little John,
They both are gone to fair, O!
And we will to the jolly green woods
To hunt the fox and hare, O!

>CH

What of those noble Spaniards
That make so brave a boast O!
Why they shall eat the feathered goose,
And we shall eat the roast, O!

>CH

Must add that in some Renfest groups, the words "May, O" bring a call of "Hold the Mayo!" and "day, O!" brings a diversion at least once into "Daylight Come and Me Want To Go Home" a la Harry Belafonte, after which the song is resumed with some muttering from those not engaged in calypso shenanigans.

-- Heather P in Bremerton, WA (for now)