My music on my 4s iPhone is missing?

I plugged my iphone 4 into the computer and transferred music from an iPod of my friends then unplugged it and now all of my music is missing that I had before. How do I get it back?

Best thing I can tell you is to make sure you use iTunes to transfer music ONLY because we all know how strict apple is, just plug it in and try copying all the music files and pasting them into your device under devices in iTunes or manually dragging them into it. HOPE THIS HELPS!

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