Jon Julius Sandal has 125 Golden Core concerts.

Golden Core is a metal band from Oslo and consists of Simen Harstad on guitar and Johannes Thor Sandal on drums. The two young hard rockers started playing together at Fyrhuset music workshop in the winter of 2014 and had their first performance on June 7 of that year, when they were 9 and 11 years old. Later that year they got to try out on the youth scene at GranittRock and have since played several concerts and have been touring, even warming up for Napalm Death.