The Norwegian-born vocalist, Sissel, wowed thousands gathered in the Conference Center Friday night for “Music for a Summer Evening.” Sissel is known for her ethereal arias throughout the Oscar-winning film “Titanic.” A second performance will be held Saturday night at 8 p.m. and will be streamed on thetabernaclechoir.org. In addition, the concert will air on BYUtv Sunday, July 21, at 5 p.m., 9 p.m. and midnight (Mountain Daylight Time). Sissel will also join the choir for “Music and the Spoken