Product Review

From the old skool referencing ''Gadget Funk,'' through the spy theme atmospherics of ''The Missing Suitcase,'' the cartoon psychedelia of the previously unreleased ''March of the Dead Things,'' and the epic reach of both ''Stranded On Earth'' (from 2008's Same as It Never Was on !K7) and the beautiful ''A Song For Mary,'' Herbal Tonic shows the musical mastery that a pair of hip hop heads from South West London developed.