I am trying to free up space on my hard drive. I am wondering what if any of the itunes files for apps or music can be deleted without affecting the use of them in the future if they are loaded on my i phone and i pad 2?

When I search my hard drive to find space for freeing up memory I have a lot of files for Apps, and music.  I am wondering if these are pertinant and need to be kept on my hard drive, or if I can remove them in any way.
Any help would be appreciated.
Thanks

I am going to revise my question to this.  If I compress my itunes folder which would save me a considerable amount of space will this make the music and apps information stored in there unsyncable? 

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