Here's where you'll find some very, very nice namesake guitars. There's Grammy Award winning, Wilco front man Jeff Tweedy's 00-DB with its solid FSC certified mahogany back and sides - a first for Martin in a Custom Artist model. The exquisite 00-42SC John Mayer, what he likes to call his "stagecoach guitar," features solid cocobolo back and sides and a custom 45 style rosette that travels elegantly across the fingerboard, another Martin first. The Ed Sheeran X Signature model features an inlaid Koa "x" on the solid spruce top, as well as green "x" style fret markers and a unique headstock inlay. These stunning guitars only scratch the surface of the Custom Signature Series.