He has toured extensively with many bands, including Metallica, Iron Maiden, Def Leppard, Mötley Crüe, Van Halen, Aerosmith, The Black Crowes, Ozzy Osbourne, Kiss, Soundgarden, Queens of the Stone Age, and The Mars Volta, just to name a few.
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After linking up with writers Geoff Barton and Peter Makowski, Halfin moved on to working mainly in the US with bands like AC/DC, UFO, Rush, Journey, Aerosmith, and Black Sabbath.
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