This reminds me of Motherboard's short documentary of Andy Cavatorta, who also made a magnetically driven harp. <a href="https://www.youtube.com/watch?v=uSkIyocJNTc" rel="nofollow">https://www.youtube.com/watch?v=uSkIyocJNTc</a> His technique is more 'rustic' than the studies linked here.