Many years ago, I bought a tape that was discounted for no reason that I knew of. It was by 'Synergy',and the album/tape was titled 'chords'. Synergy was a group that used all electronic types of music. The tape had an unusual quality to it. One that carried you deep into thought, but might depress you as well. Years later, I bought the cd. To my surprise, it didn't sound 'right'. Turns out, the entire tape was stretched! It didn't really warble that much, and considering the group that made the album, it was quite likely to have to sound like it did!