Bella’s Bartok are known for fierce, unhinged performances. Self-described as “a mix of The Nightmare Before Christmas and The Rocky Horror Picture Show,” the band emphasizes theatrics and whimsy. Its unpredictable antics may include band members crowd-surfing while encased in a giant plastic bubble, or equipping audiences with rainbow-colored pool noodles. With music rooted in both European and American folk traditions, the Northampton, Mass., ensemble injects raw punk energy into old-world styles, resulting in a glitter bomb of raucous, vaudevillian proportions. Bella’s Bartok perform on Friday, October 11, at the Higher Ground Showcase Lounge in South Burlington. Blind Owl Band add support.