
.... is how the word trephine is defined in a dictionary ...
musically speaking however:
" ... (trephine) sound like unfinished metallic mini-operas played by  musical mad scientists taking the best parts of one idea and applying it  to the next uncharted direction."   -Metal Maniacs
"If Mars Volta and Yes swung the ropes in a game of double-dutch for  Mastodon with Voivod and Mr. Bungle kicking cans along the gutter, you  might get the unpredictable street soiree that comprises Baltimores'  Trephine."
-Live 4 Metal
                                                                              "Baltimore's Trephine delivers an invasive blend of black, shale rock  like Jack the Ripper on acid strapped in a chair watching a slow-motion  train wreck while trying to psychically manage an exploding cosmos."
-sk
"Purely instrumental math-rock with teeth, this plays like some rabid ,  Slayer-ized version of Don Cabellero... The Fucking Champs meet  Mastodon... Clutch and Moe Staiano's Moe!kestra!... or something like  that.  These guys pull off some obtuse, angular riffage and jazzy beats  but keep this firmly rooted in the HEAVY, balancing all of the abrupt  shifts, propane-tank percussion, and complex shredding and abstract  structures with some serious metalcore riffs, swaggering Southern sludge  ,and over-all evil-sounding crunchiness."
-Crucial Blast Records
"... one of the most distinctive metal acts gracing the  underground and deserves to be heard far and wide."
-Fishcom Collective
"Imagine the bastard offspring of King Crimson and the Melvins sold to  the traveling freak show... moody prog rock pieces to heavy noise complex  math rock chaotic assaults... recommended listening for your next  surgery disaster."
-Jackalblaster
"... a bit metal, a bit sludge, a bit math rock and all  good, so definitely give these guys a listen... "
-Daredevil Magazine
"If you like music at all, dig up Trephine and rediscover whats so  enchanting about this audible form of art."
-Ultimate Metal
"...teeming with demented circus tunes, futuristic robot sock hops, and  dark forays into doom-land ... these guys are well aware of their  abilities to drop jaws with the kind of cyclical riffery that will leave  your head in a thick but welcome fog.  So when they flirt with jazzy  elements and mathed-out herky jerks, it just pushes this one into the  realm of brilliance. You wont be disappointed."
-The Nerve
"TREPHINE dodges in and out of traffic while juggling sharp objects and  simultaneously kicking dirt in your face."
-Peacedogman
"To put it as easily as possible, it's as if Buckethead somehow lent his  DNA to Candiria, found a way to wash out the hip-hop elements,  dismembered Carley Coma, and then fed this scientific hybrid a steady  diet of Coltrane, Davis, Beefheart, and Patton. Then left it to fend for  itself for twenty more years. And did this four times (once for each  member)... If you thought Dysrhythmia or Pelican were intriguing and  awe-inspiring, you haven't heard Trephine. This is a shameful release,  leaving all other instrumental prog-funk-jazz-metal fusion bands in a  wake of scattered ashes, debris, and unrecognizable bone structure."
-Decoy Magazine
trephine - s-t