Download Audacity for MacOS X. It is a free application that will load the .mp3 file and show you the waveform. You can then start at the beginning and visually pick out the first dead spot (little or no sound), scroll to it, verify this is the end of the song and then finally split the file where appropriate and save the previous piece as it's own .mp3 file. In this manner, you can step through an album (or anything else for that matter) and split out each individual track, name it and save it.