Karl Groom

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Karl Groom (2015)

Karl Groom is a British guitarist and record producer. He is best known as a founding and the only constant member of the progressive metal band Threshold. His production and mixing credits are mainly with progressive and power metal bands.[1]


Karl Groom is the guitarist in Threshold and formed the band in 1988. He has since produced and released eight studio albums and is currently signed to Nuclear Blast. In addition there was a live DVD entitled Critical Energy in 2004 whilst on the Inside Out Music label. He also played guitar in Mercy Train, Shadowland, and Strangers on a Train all during the mid-1990s. In 2017 he played all acoustic guitars on Galahad's 'Quiet Storms' album.


Karl Groom works from his own Thin Ice Studios since 1990. The recording facility was originally located in Berkshire, but moved to Surrey in 1995. He is mostly known for metal styles of production such as Threshold and DragonForce, but has also worked on progressive acts including Yes, Pendragon, Galahad, Ulysses (Germany) and John Wetton. The Strangers On A Train albums were rereleased in 2012 on the Polish Metal Mind Label.

p – produced, e – engineered, m – mixed, g – guest musician


  1. ^ Hill, Gary. "Biography: Threshold". Allmusic. Retrieved 17 February 2011. 

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