Shortly after the release, Mary Ann Nagel decided to leave the group.Her spot was taken by Heike Rimbeau. In 1978, they released the successful album, "Friday Night". Karen Ann Tepperis had a son in 1978 and left the group. A former gymnast named Jasmin Vetter replaced her. Heike left the group in 1979 due to her pregnancy. A country singer named Elke Brückheimer replaced Heike for a few months. Finally in June 1979, Sandra Ann Lauer was accepted into the group. The trio had members Michaela, Jasmin and Sandra from 1979, until they split.