Lame is a pretty cool linux program you can use to batch process MP3 files:
lame --resample 22.05 --scale 10 -b 48 -a HowBizarre.wav -o HowBizarreLoud.mp3
while i'm at it; here is the whole script
#!/bin/bash
for k in *
do
lame --resample 22.05 --scale 10 -b 48 -a $k -o ${k%.wav}.mp3
done
