Before getting on stage, the trio seems like such a charming, mild-mannered bunch. But during their set, an irrepressible spirit, an electrifying enthusiasm, coursed through the band. At one point front woman Ritzy Bryan told us about where the band is originally from in North Wales, where there are big, rolling hills and mountains. It's a lot like Colorado, she noted, and that when it was starting out, The Joy Formidable wanted to make a sound that the mountains might make. The manifestation of that early ambition was sure on full display last night.