The world's leading period instrument Orchestra. Ok, itâ€™s a not very snappy name, so we tend to call ourselves the OAE. The OAE is probably one of the top â€˜period instrumentâ€™ Orchestras in the world. What does this mean? Well, over the years instruments and techniques have changed. We try to be authentic, by using instruments and playing styles similar to those the composer would have been familiar with. You get to hear what Vivaldi actually wrote, not a modern version of it.