Passage: Cameron wrote Titanic while listening to the work of Irish new-age musician Enya. He offered Enya the chance to compose for the film, but she declined. Cameron instead chose James Horner to compose the film's score. The two had parted ways after a tumultuous working experience on Aliens, but Titanic cemented a successful collaboration that lasted until Horner's death. For the vocals heard throughout the film, subsequently described by Earle Hitchner of The Wall Street Journal as "evocative", Horner chose Norwegian singer Sissel Kyrkjebø, commonly known as "Sissel". Horner knew Sissel from her album Innerst i sjelen, and he particularly liked how she sang "Eg veit i himmerik ei borg" ("I Know in Heaven There Is a Castle"). He had tried twenty-five or thirty singers before he finally chose Sissel as the voice to create specific moods within the film.Horner additionally wrote the song "My Heart Will Go On" in secret with Will Jennings because Cameron did not want any songs with singing in the film. Céline Dion agreed to record a demo with the persuasion of her husband René Angélil. Horner waited until Cameron was in an appropriate mood before presenting him with the song. After playing it several times, Cameron declared his approval, although worried that he would have been criticized for "going commercial at the end of the movie". Cameron also wanted to appease anxious studio executives and "saw that a hit song from his movie could only be a positive factor in guaranteeing its completion".

Question: How did Horner noticed Sissel?
her album Innerst i sjelen