sorry for not writing back before, it's been a hard week for me. somehow i guess am getting better.. i hope u are ok there too
that song (if u don't have the traslation of the lyrics let me know) it's suposed to be part of a dialogue between Quijote and his squire Sancho, u know at the time America was discovered, in 1492 Spain had a small royalty but some years later, the kings gave titles of nobilty to anyone that found any place or tribe to make the kingdom bigger, and don quijote it's supposed to be a lord, the writer makes u think that his family has been always part of the nobilty... anyway, the whole book it's a mockery for all the knights and nobel familys, so don Quijote is a knight who comes from a great family and is really senseless, and one of his most noted adventures is:
he and sancho are traveling across the country, and in a meadow, in the distance they see windmills, but don Quijote is convinced those are giants, and he attacks them---
and well this song is supposed to be the sermon don Quijote gives to Sancho, cuz he is so mind closed... well cuz Sancho said to him those were windmills
if u wanna know more about that or the translated song tell me

take care