There are no breaks between songs and no disruptive changes in speed. A tape from your favorite artist would be useless for running.
Some songs are too fast, others too slow and there are disruptive gaps between the songs.
You state that running to your music will improve your performance. All you do is follow the beat and enjoy the music. You'll run farther and faster with apparently less effort. Running Music gives you an exact leg speed since you are following the steady beat of the music. However, stride length varies tremendously from runner to runner and that's why we give you a pace range for the music.