The bit that begins with id identifies the album; the bit after the ? is the song id. Clicking the link will take you to the album on the Web, possibly with the song highlighted (this behavior is inconsistent). But if you click to view that track in iTunes, you'll just go to the album page in the iTunes Store. (The link will be for whatever country's store you were browsing when you copied the link.) That should be sufficient for what you need.
Alternatively, select the Tell a Friend option in the same pop-up menu. Then enter your friends' email addresses, and Apple will send them the link.
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