You found it.
You'll need a recent version of the (free beta of) RealAudio player

"Morao" by Vicente Amigo (32Kbit/s Stereo - for 56K, ISDN or better)
(with slower connections playback will be interrupted, 33K6 modem may be just fast enough)

"Morao" by Vicente Amigo (16Kbit/s Mono - for 33k6 or less modem)
(lower quality, should playback uninterrupted with an average modem connection)