Download lame and mplayer:

sudo apt-get install lame mplayer

convert rm to wav:

mplayer islam77.rm -ao pcm:file=islam77.wav

convert wav to mp3:

lame --tt "title" --ta "author" --tl "album" --id3v2-only islam77.wav islam77.mp3

adapted from Ubuntuforums.org

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