If you are able to incorporate the high energy and lyrics of 'Hal an Tow', it would make a marvelous intro or parting piece.

http://www.emusic.com/album/10593/10593379.html gives you an opportunity to hear Oysterband's great version. Warning - it's a real earworm and you'll be humming it all day!

Relevant lyrics below:

Hal an tow, jolly rumble oh
We were up long before the day oh
To welcome in the summer
To welcome in the may oh
The summer is a-comin' in
And winter's gone away oh

Robin hood and little john
Have both gone to the fair oh
And we will to the merry green wood
To hunt the buck and hare oh

[chorus]

What happened to the spaniard
That made so great a boast oh
They shall eat the feathered goose
And we shall eat the roast oh

[chorus]

The lord and lady bless you
With all their power and might oh
And send their peace upon us
And bring peace by day and night oh

[chorus]

--
Another version

Robin hood and little john
They both are gone to fair o!
And we will go to the merry green-woods
To see what they do there, o!
And for to chase the buck and doe.