How do I get the music from the phone back to the computer?

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Lost entire ITunes on my computer had to reinstall.  All music is still on my IPhone 3GS but I can't get it back into ITunes on the computer.  Had a lot of CD's from my CD collection.  Don't wanna click the wrong thing afraid I will loose all of it!
Do you have a Backup of your Computer... Time Machine... External Hard Drive...?
If not, See this Older Discussion:
Also see Here:
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