From the Apple StackExchange (user nqw1), this Terminal command will take all the WAV files in a folder and turn them into MP3s:
find . -name '*.wav' -maxdepth 1 -exec /usr/local/bin/lame -V 0 -q 0 '{}' \;
Apparently this is the highest quality (V is the best variable bitrate and q is the quality). This is apparently a bit faster and is the recommended setting:
find . -name '*.wav' -maxdepth 1 -exec /usr/local/bin/lame -V 0 -q 2 '{}' \;
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