RealAudio files require the Real Player which is available
at www.real.com. With these files
you may listen while your computer downloads them, but audio quality
may suffer if you have a slow connection.
MP3 files require an MP3 player such as SoundJam MP which
is available at www.soundjam.com.
Typically you must download the entire file before you may listen
to it. For people with a slow connection this may take quite some
time but you will be rewarded by nearly CD-quality music.