Altered State is the second studio album by British progressive metal band Tesseract, released on 27 May 2013 on Century Media Records.
Altered State is the only full release by the band with vocalist Ashe O'Hara. Amos Williams stated about the new singer: "It's amazing how much one person can change a band. Ashe is full of life and wit. It's brilliant to have such a guy around. You know, we're still Tesseract, but with a slightly more energetic and vibrant colour about us now". Live drums for the album could not be recorded due to financial and time restraints; drums were partially programmed by guitarist Acle Kahney and partially played by drummer Jay Postones on a digital percussion pad.
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