"Oh, no, my hard drive is dead.....and, of course, I have no back up. This is my music library, about 8000 songs. I turn on the hard drive and it goes, "click, click, click" and my MacBook Pro does not recognize it. Please tell me that there is something I can do to recover my stuff, and if so, what? Thank you very much."
You have just learned the HARD WAY about why it's necessary to back up stuff that's important to you.
If the drive is truly broken - by that I mean an internal hardware failure that won't let the drive spin - and you decide to choose a "professional data recovery" place, be prepared to spend upwards of $750 to $1,500 to get your data back.
But before you do that, consider: "Do I really want to spend this much for some music?"
Let me offer you a strategy for future backups:
1. Get one of these gadgets:
http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias=aps&field-keywords=usb+sata+dock&x=0&y=0
(Many items show, all are cheap, all work the same)
2. Then, get AT LEAST TWO "bare hard drives" from the vendor of your choice. (I like newegg.com)
3. Get the FREE "CarbonCopyCloner" backup utility from bombich.com.
You can swap drives around for backing up, quick and easy.