Music editing program?

I'm looking for some sort of application that will allow me to take my music and cut parts of it out. For instance, there's a song that I like but I don't care for the second half of it because it's part of an interlude to the next song. Can Garage Band do this for me or is there something else I should use?

 

Yeah after being annoyed at MP3 Trimmer's trial version I picked up Audacity. Works awesome