saving sound from internet

vsound will capture sound
Description: Virtual loopback sound recorder and real audio converter
This program allows you to record the output of any standard OSS
program (one that uses /dev/dsp for sound) without having to modify or
recompile the program. It uses sox to convert and save the raw data
into the desired file format and can help to convert real audio files
to some other non-proprietary format.

you can probably use

mplayer -v -dumpstream rtsp://linktoaudofile.rm -dumpfile audio.rm
Replace the rtsp://linktoaudofile.rm with the corresponding link you want to
download.