Celine Dion isn't the only golden throat on the Titanic soundtrack. That Enya-esque voice weaving majestically through the score's orchestral numbers belongs to Sissel, a 28-year-old Norwegian singer who's as huge a pop star in her homeland as she is unknown in America. How'd she get the gig? ''James Horner had heard one of my albums and loved my voice,'' says the pixieish chanteuse, in New York to begin work on her first Stateside pop album with producer Rick Chertoff (Joan Osborne). ''He originally wanted me to sing in The Devil's Own, but I couldn't do it because I was on tour. Then he said, 'I have this other movie that's probably even better for you.'''
With the Titanic score under her belt, Sissel says she hopes to make ''a timeless album'' with Chertoff. But Titanic fans don't have to wait for that project's completion for another taste of Sissel: A single, ''Prince Igor The Rapsody,'' her opera-meets-hip-hop collaboration with Warren G, is available now as an import. With G providing chilled-out, gangsta-style lyrics, and Sissel warbling a variation on the title aria from Prince Igor, it may be just the shot of street cred this highbrow thrush needs.