Today I found a most excellent command line from the Ubuntu forums by mc4man. I'm just going to note it down here so that I don't have to go searching for it every time:
mkdir temp && for f in *.wav; do lame --vbr-new -V 3 "$f" ./temp/"${f%.wav}.mp3"; done
mkdir temp && for f in *.wav; do lame --vbr-new -V 3 "$f" ./temp/"${f%.wav}.mp3"; done
