Saxophonist Martin Krusche is sitting at the dining room table in his Ninth Ward home alongside saxophonist Dan Oestreicher, trombonists Wes Anderson IV and Jon Ramm­Gramenz, tuba player Steven Glenn and drummer Paul Thibodeaux, the musicians who these days comprise his long­-running, ever-evolving band, Magnetic Ear. It’s early spring and they’ve just wrapped a rehearsal for the CD release party for their latest album, Live at Vaughan’s. Krusche, with some help from Oestreicher, is ...