Hepp!

Can someone explain what the problem migth be when a newly installed and newly scanned disc (not involving the use of iTunes) plays "wrong songs"? Choosing to play song "A" gives me the tunes of song "X". Some song even only plays like horrible noise. I have scanned a disc with .wav files which has the struture of:
foldername=Artist,
foldername=Album,
filename=song.wav
some album play correct, others not..

HELP!