This is a performance of the Blade Runner score by The New American Orchestra. It is *not* the original soundtrack to the film. It's an interesting take on the score and for true fans may well be worth having. For a number of years, the actual soundtrack by Vangelis was not available and this version was the only version available. There's nothing wrong with this alternate version, the problem is that it uses the same artwork as the Vangelis score and from the CD listing here, it's not clear that it's not the Vangelis-performed version.
What's great about it: Interesting take on Vangelis score