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this is a shortened version of http://www.gentoo-wiki.info/HOWTO_Create_an_Audio_CD.

shift your mp3 files (or whatever format your music is in) to a directory and cd there.

Remove any spaces from the filenames:

for i in *.mp3; do mv "$i" `echo $i | tr ' ' '_'`; done

Convert all the files to .wav format:

for i in *; do ffmpeg -i "$i" -acodec pcm_s16le -ar 44100 -ac 2 -f wav "$i.wav"; done
or
for i in *.mp3; do mpg321 -w "`basename "$i" .mp3`.wav" "$i"; done

make sure all the files are compliant:

file *.wav | grep -v 44100
(should have no output)

Normalize the music if from differing sources:

normalize -m *.wav

then burn the music to disc:

cdrecord -scanbus 
- to find out your CD virtual SCSI path (something like 1,0,0)
cdrecord -v dev=1,0,0 -audio -pad *.wav

or the quick and dirty bash script:

#!/bin/bash
for i in *.mp3; do mv "$i" `echo $i | tr ' ' '_'`; done
for i in *.mp3; do lame --decode "$i" "`basename "$i" .mp3`.wav"; done
normalize *.wav
echo CD_DA > cd
for x in *.wav; do echo "
TRACK AUDIO
AUDIOFILE \"$x\" 0" >> cd
cdrdao write --device ATA:0,0,0 cd; done;

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