Check the listing for details. Reverend Greg Koch Gristle 90 Solidbody Electric Guitar - Midnight Black. Condition: New. Listed at 1899.00 USD. Looks Like a Classic and Plays Like a Modern Marvel The Reverend Greg Koch Gristle 90 solidbody electric guitar takes the classic T-style guitar to a new level of sonic prowess. Loaded with the Fishman Fluence Greg Koch "Gristle-Tone" Signature P-90 pickup set, you can switch between two distinct voicings on the fly with the push of a button. These innovative active pickups also eliminate noise from your signal, and offer up to 60 hours of playtime on a single charge. Complete with a Bigsby tremolo tailpiece, optimized with a roller bridge and a Soft Touch spring for a smooth and expressive response, the Reverend Greg Koch Gristle 90 guitar imbues a classic guitar design with modern advancements any player will appreciate.