Not sure what your post has to do with the topic.

Try files from a different source. Download from a different person & see if same problem. Also, check the files with a different player, since there are more capable players for OSX than iTunes (or LW's media player); I'd recommend both ToolPlayer & Switch, Alternate Audio Players & support plug-ins. ToolPlayer is very simple player but can play a wide range of music formats. Switch is a converter but can also play a reasonable range of formats.