Any linux command to perform parallel decompression of tar.bz2 file?

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http://askubuntu.com – I have a rather large file (~50GB) and it takes some time to run tar xvf file.tar.bz2 on it. I'm aware of programs that can do parallel compression for bzip2 files but unaware of programs that can do parallel decompression for bzip2 files. Are there any programs that can achieve this? What is the exact syntax of the command to use to extract from the file? I'm using ubuntu 12.04 (HowTos)