Answer:
Up on high I wave away but not a word can I say.
What is broken if you say its name?
Tickle with your fingers and a song it will sing. Be careful, though, you may break a string. What is it?
What has 4 fingers and a thumb, but is not living?
It's been around for millions of years, but it's no more than a month old. What is it?
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.