HT203225: If you don't see your entire library after you update iTunes on your Mac or PC
Learn about If you don't see your entire library after you update iTunes on your Mac or PC
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Oct 13, 2015 2:27 PM in response to sonicmikolby Limnos,Of course you can replace them! Use whatever source you had originally. You did keep all the CDs, didn't you, because you knew they represented your ownership of the music... iTunes Store purchases can probably be re-downloaded. If all your files are indeed missing and you have no backups you have no other recourse.
Sure, this has happened before, but it is rare (you see more posts about it here because this is where to handful of people to whom it has happened come to post, and the millions of people to whom it has not happened don't bother to come here and say "Installed iTunes; no problems!"). It is, however, exactly why one is encouraged to make computer backup before doing any significant changes to a computer such as installing new software.