Having Peter Murphy turn up in the Twilight movies is akin to getting Tony Benn in to sit in on your school council. Sure, he can do the job, but it only points up how low-powered the surroundings are.
The press release which thinks its selling the appearance only really stresses what a lousy idea this is:
Murphy’s last film appearance was in 1983 when Bauhaus performed “Bela Lugosi’s Dead” in the opening credit sequence of Tony Scott’s vampire thriller The Hunger starring David Bowie, Catherine De Neuve and Susan Sarandon.
And now he's going to be Twilight II: Eclipse, which is adapted from the book by Stephanie Meyer, which in turn is adapted from putting Anne Rice novels in a machine that drains them of any interest.
Here's The Hunger:
And here's Twilight: