You need
RAPlay off Aminet and if you want to stream them files, you also need
StreamRAedit:
In this archive there is also an ARexx script to stream .ra files straight off
the web using the widely used .ram files .. to use this you need to get and
install rxsocket.library (which you should anyways, it rules) and set the
following MIME-types in your favourite browser:
MIME: audio/x-pn-realaudio
Extension: ram
Ext. Viewer: (selected)
Viewer: SYS:RexxC/RX
Arguments: Your:Path/StreamRA.rx %f
If you make sure the S-bit is set on StreamRA.rx you won't have to put RX
infront of it ("Protect StreamRA.rx +s" (if so, put StreamRA.rx as viewer))...