The dancers came through the sliding door at the back of Betty Jo Schmitt's Rosemount house and slipped downstairs to practice on the concrete floor, just six at a time.
That was in 1975, at the very beginning of what would become Betty Jo's Dance Center.
"It was not a good floor for dancing," Schmitt said. "That was the place that I could afford."
Still, she had 39 students that first year, and her students stuck with her. This year, with more than 400 students, Betty Jo's Dance Center celebrates its 40th anniversary.
Schmitt, 67, started dancing at age 3 and became an avid tap dancer. She taught elementary school for five years in her 20s. But as a new mom, she didn't want to work full time. So she started the evening dance class in the basement.
Schmitt's daughter Annie Ganot recalls a much more magical scene than her mother does. Ganot and her sister used to sneak downstairs to watch the dancers practicing.
"It was so much fun," she said.
Over the years, the studio grew and moved to several locations in Rosemount before landing in its current spot in Apple Valley. Betty Jo's Dance Center now has four studios with sprung floors designed for dance in a 6,700-square-foot space near the intersection of Pilot Knob Road and County Road 42.