In Garageband I am trying to make remixes of some songs I have. In garageband help it says "You can add a loop or other audio file to a song by dragging it directly from the Finder to the timeline. You can drag the audio file either to a Real Instrument track or to an empty area below the existing tracks. Supported file formats are: AIFF, WAV, MP3, and AAC (except protected AAC files)." And it's so weird because for some mp3s and m4as it just does not work, but for others, it does! For the files that don't work, it still shows a progress bar saying, "Importing file" and then it fills up but nothing happens. Does anyone know about this and how to get it to work?