By ROBERT BUSH, Published: October 21, 2010 He doesn't receive anywhere near the publicity given to his friend, and fellow bassist, William Parker, but make no mistake about it: Mark Dresser is a giant in the free jazz / new music continuum and has been so for years. First up, the DVD. Anyone who has had the good fortune to witness Dresser perform in the last 20 or so years can attest to the notion that he is a master of extended techniques on the contrabass. Many of these are mind boggling both visually and aurally. Others, however, are subtle to the naked-eye and one of the beauties of this DVD is how it reveals and explains such hidden techniques.  Second up, the CD.  There is too much remarkable music for a blow-by-blow accounting, so here are some of the highlights. To begin with, although it might be hard to believe, there are no overdubs on the disc. --All About JazzIn the belly of the bass: Mark Dresser  By Ratzo B. Harris on January 18, 2011 Guts is not just a new release by Mark Dresser, but an important treatise on the state of music making. --New Music Box