Richie Stearns is one of the country’s most highly regarded banjo players, a veteran performer whose credits include touring with Natalie Merchant and leading the groups the Horse Flies and Donna the Buffalo. Rosie Newton, meanwhile, is a relative newbie, a young fiddle ace who tours with, among others, acts such as the Duhks and the Evil City String Band. Together as Richie and Rosie, the duo trades on the former’s knowledge and virtuosity and the latter’s youthful vigor and prodigious chops to push the boundaries of Americana music. Richie and Rosie play the Skinny Pancake in Montpelier this Thursday, September 26.