As well as visual arts there were a couple of stages at the festival where local bands performed. I was impressed by a group of locals that 'flash mobbed' with a dance routine. I managed to video some of it on my phone and the link is here
For some reason they reminded me of a Cirque du Soleil kind of group; they were unique, polished and as well as having very good vocals, they were all talented musicians who made a wonderful display of their performances. Their website is here
Once you've seen their past show photos or videos, you'll understand why I initially was reminded of Cirque du Soleil..
which is here but there are quite a few on YouTube. I was mesmerized by them and wished I caught the earlier part of their performance. I shall definitely be looking out for this talented group in the DC area.