Okay, here is a mac question:
On my old PC, I was able to use a program called Goldwave that was online and free, and it enabled me to break up and edit songs (like, if I wanted to edit a 30-minute song down into five different tracks for the purposes of making it easier to skip to parts of the song if on a short drive or something). Is there a similar program for macs that is easy to use and free?