Converting audio files from .m4a to .mp3 or .ogg from cli?

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http://crunchbanglinux.org – Does anyone know of an elegant CLI tool for converting a large number (hundreds) of .m4a audio files to .mp3 or .ogg? Ideally, this tool would work recursively in a file directory so I could just set it loose on my music collection.I'm aware of soundconverter but it's running ridiculously slow on my netbook so I'm looking for something a little more lightweight... (HowTos)