lorrie, if you have QuickTime (which comes with the system software)on your Mac, then you have an MP3 player. If you open (double click) the downloaded music files in the Shared folder of Limewire, Quicktime Player should play them. For some reason, mpeg (video) files will open if i double click onthem right in the Limewire Search page, but the mp3 files dont seem to open this way. Eggboy