What's in Your Head? is the sixth album by British heavy metal band Diamond Head. This was Diamond Head's second and last album with singer Nick Tart and the follow-up to 2005's comeback album All Will Be Revealed. While the previous album was produced by Diamond Head's drummer Karl Wilcox, the band this time worked with producer Dave Nicholls, who has previously worked with name bands such as Slipknot and Stone Sour. This is also the first album to feature guitarist Andy Abberley.
The Japanese release of this album contained "This Is War" as a bonus track.
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