We got tickets to the Christmas concert at the cathedral as a gift. Concerts in the cathedral are awesome. The building itself inspires awe, and then the acoustics are really exceptional. Gave me shivers!
The show was an hour, featuring an orchestra, a violinist, the Trondheim Solonistene choir, and the Trondheim Guttekor (boy's choir). This was an excellent was to get further into the Christmas spirit.