Two questions...

Factual Questions
1

  1. Who was “the May Queen” who apparently needed a “spring-clean” In Led Zeppelin’s “Stairway to heaven”?

  2. How do Rewritable CDs work? I thought that CD content had to be ETCHED on to the disc. If this is true, how could you rewrite the CD several times without wearing it away to nothing?

2

The first explanation I found was from this site which is rather funny, but wrong.

From Brewer’s Dictionary of Phrase and Fable we learn that a May-Queen is a girl chosen to lead the sports and games celebrating May Day. (See Tennyson’s Poem “The May Queen”)
Or, if you prefer the fun stuff, try this site for an anagram of the full lyrics to “Stairway to Heaven”

and, for your other question:

[sic]

from the first CD-RW FAQ that I found on Google

3

The May Queen is one figure of the Goddess in (Celtic? Ancient British?) mythology.
There is a brief depiction here:
http://www.beltane.org/chars/queen.htm

In Stairway, she is not the one being cleaned. Rather,
If there’s a bustle in your hedgerow
Don’t be alarmed now.
It’s just a spring clean for the May-queen.
Nature (or Elements or Spirits of Nature) are doing spring cleaning in preparation for her arrival at Beltane and you may hear them bustling around in the thick hedge at the end of your property.

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You’ll have to hope a techie or geek stops by with an answer to your CD question.

4

Most pop music is just cheesy poetry, spend enough time looking for the ‘hidden’ meaning and eventually you’ll realize most musicians just pull it out of their ass.

Conventional mass-produced CDs are stamped with teeny tiny pits. CD-Rs and CD-RWs aren’t, they’ve got a layer of dye that reacts to light energy. The writing laser can make the dye go black and make CD players believe that dark spot is really the pit of a stamped CD.

I’m not sure how CD-RWs work, either they’ve got multiple dye layers or a special resuable dye.