Swedish melodic death metal pioneers AT THE GATES were joined by special guests Andy La Rocque (KING DIAMOND), Jesper Jarold on violin and Mikael Stanne (DARK TRANQUILLITY; vocals on “World Of Lies”) during their appearance at the Metaltown festival, which was held June 17-18, 2011 in Gothenburg, Sweden.

Fan-filmed video footage of Stanne‘s appearance can be seen below. A photo of La Rocque performing with AT THE GATES is available at this location. Source: Blabbermouth.net