FORT COLLINS — Mariana Henke stood barefoot while strumming her black guitar on stage. She played several original songs as teachers from across the country listened. ?More than 500 educators from across the United States gathered July 7-11 at Colorado State University for the sixth annual Modern Band Summit, presented by Little Kids Rock in partnership with the Bohemian Foundation. Henke, 18, of Fort Collins, got her start with music thanks to Little Kids Rock.