In "MELA and STELA BAAM Dance Rehearsal by MOMOLAND," the sisters practice their choreography for the catchy song "BAAM." The vlog captures their dedication and enthusiasm as they learn the dance moves, showcasing their teamwork and playful interactions. Viewers enjoy the behind-the-scenes look at their rehearsal process, highlighting the joy of dance and the special bond between Mela and Stela as they prepare for their performance.