Rare 70's Electronical Music / Hunger Games Soundtrack

When reading the article about the rare 70's electronical music created by Laurie Spiegel, in the soundtrack of The Hunger Games I couldn't help to think about why they decided to use other popular indie rocker bands in their 'official' soundtrack rather than the  analog synthesizer and old-school tape machines that were used in the movies sound design. I believe that the rare music was definitely very fitting for the newly released movie, but at the same time the audiences would better relate to the new indie rocker groups such as Taylor Swift. Its a very drone sound at first but it really captures the essence of the film, it almost puts you in a trance! Very amazing, I haven't be fortunate enough to see The Hunger Games yet but this has definitely inspired me too a little more.