Lost files!

So I got an urge to play "The Way you want it to be"...huh...can't find it. Wait a minute, I have more Conjure One than this...where the f*** is my music? Nooo! Oh my god. My files are disappearing. What else have I lost. My life's work. No!! This is not good. I'm freaking out! This makes me realize...it's time to go RAID.