"iTunes Media" file in "Previous iTunes Library" taking up 50Gb of much-needed hard drive space.  Can this be safely deleted?

Hi everyone,
My 3.5 year old 15" Macbook Pro is running out of hard drive space, so I have been trying to clean out some of the dross.  I recently found that there is a file called "Previous iTunes Library" in my iTunes folder that is taking up approximately 50Gb of space.   I would love to delete this folder and reclaim the space, but I am not sure what it is or where it came from, and I don't want to lose music files accidentally. Can someone tell me (1) what this folder is and (2) if I can safely delete it?
Here is a screenshot of these folders and their sizes:
Thanks for the help!

Hello facetious1212,
Take a look at this part of the article named iTunes: What are the iTunes library files? Found here http://support.apple.com/kb/ht1660.
Tip: New versions of iTunes sometimes include enhancements to the iTunes library. When you open the new version of iTunes, iTunes upgrades your existing library to the new format and places a copy of the old library in the Previous Libraries folder. If everything goes fine during your upgrade to the latest version of iTunes, you can delete the older iTunes Library files.
All the very best,
Sterling

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