A disco band in the heart of corn country? A glittering pop ensemble arriving to the little dance hall on the prairie in a white, stretch limousine? With four neatly pressed canary-yellow pearl-button shirts and matching eggshell vests and pants, to boot? The Golden Bubbles have been spinning this magical pop fantasy onto the dusty streets of Minnesota and South Dakota since early 2008. Original songwriting that has caught the attention of Minneapolis Star Tribune columnist Chris Riemenschneider (“It’s fun stuff…full of playful