Note that the music files of the song are not of CD quality, to keep the files smaller for more rapid downloading. The playback version, however, is of CD quality, to be used for creating one's own recording.
If you see a screen of random data, that is your browser trying to download the audio (mp3) file as a text file, which means it does not have the plugin installed. Install it by clicking on the "audio software" button.
You can download the mp3 files directly by right-clicking on the links below, and then choosing "save link" or "save as" (browser dependent).