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Mean Deviation (book)
Mean
Deviation:
Four Decades
of
Progressive Heavy Metal
is a
non-fiction book
written by former
Metal
Maniacs
magazine editor
Jeff Wagner
. The
book
was illustrated by
Voivod
drummer
Michel "Away" Langevin
and has a foreword by
Porcupine Tree
frontman
Steven Wilson
.
Mean
Deviation
was published in
December 2010
by
Bazillion Points
under
supervision
of
Ian Christe
.