Here's a link to what "la rama" means.
http://www.yucatanliving.com/culture/rama-rama.htm
...Each night during Advent (the 24 days leading up to Christmas), children of the neighborhood travel from door to door singing a song and collecting money. With them they carry las ramas as well as a picture of the Virgin of Guadalupe, somehow set up with a candle. In the case of our young visitors the other night, it was a little box, with flowers and candles in front of the Virgin. Our employee Fernando who is 24 years old tells us that he used to take big empty cans and cut out both ends. On one end he would put a picture of the Virgen and then he would stick a candle in the other end to make a sort of light box. He has promised to have his sobrinos (cousins) make one for us.

In this tradition, the children go door to door in their neighborhood, singing this song. They sing or shout it very quickly so that its almost impossible to tell what they are saying
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Note added at 2 hrs (2009-10-13 22:48:25 GMT)
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;o)

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Note added at 2 hrs (2009-10-13 22:53:32 GMT)
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By the way, this tradition also takes place in several other states in Mexico. Typically children knock on your door and ask "¿Le cantamos la rama?"... it's a treat to hear them sign completely out of tune. Usually they have cans or small boxes in which they collect money for their "posadas".

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Note added at 5 days (2009-10-19 16:50:43 GMT) Post-grading
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I'm glad I was able to help!
Cheers! :))