Did the songs show up when you brought up iTunes? If not, then most likely the file that iTunes uses to track your play lists (My Music\iTunes\iTunes Music Library.xml) got corrupted somehow. If that's what happened, you might want to save a copy of that file as a backup. Or, iTunes lets you export that file (under File/Library/Export Library ...). To restore from an exported library, the command is (File/Library/Import Playlist...).
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