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Mangled Schoof - European Echoes is the closest comparison I can think of. Globe Unity Orchestra is great too, and Zu's Igneo is pretty different from Machine Gun but it's an avant-garde jazz metal thing and I think you'll dig it. The rest of Brötzmann's material is great, especially Nipples, Balls, Low Life, and For Adolphe Sax. Lemme know what you think.