This is Iggy. Duff McKagan’s column runs every Thursday on Reverb. He also writes about what’s running through his iPod every Monday. Well, in this case, Tuesday.Iggy and the Stooges, “Shake Appeal” (Raw Power): I got myself into a bit of an Iggy phase this last week after reading Watch You Bleed (By Stephen Davis). “Shake Appeal” has one of the baddest riffs ever in the history of rock and roll.Iggy Pop, “Sister Midnight” (The Idiot): Iggy has had many different phases of his career and his ‘Berlin years’ writing and recording with David Bowie stand out to me as probably the most drastic, and in a way, prolific. “Sister Midnight” is more a state of mind than a real song, but certainly showcases how ahead of its time this song was. The early use of synthesizer in conjunction with real drums and bass were to feed the imagination of a New Wave that was still six years away.Iggy Pop, “Butt Town” (Brick By Brick): Why “Butt Town”? It has a great sense of humor. And, hell, Slash and I played on it!!