In 1927, one of the most important buildings on campus, Sisters Chapel, was dedicated. The chapel was named for its primary benefactors, sisters Laura Spelman Rockefeller and Lucy Maria Spelman. The college had also begun to see an improvement in extracurricular investment in the arts, with the organization of the Spelman College Glee Club in 1925, inauguration of the much-loved Atlanta tradition of the annual Spelman-Morehouse Christmas Carol Concert and smaller events such as the spring orchestra and chorus concert, the Atlanta University Summer Theater, and the University Players, a drama organization for AUC students. The school also began to see more of a focus on collegiate education, as it discontinued its elementary and high school divisions. In 1930 the Spelman Nursery School was created as a training center for mothers and a practice arena for students who planned careers in education and child development. Spelman celebrated its 50th anniversary in April 1931. This milestone as accompanied by the construction of a university library that was shared amongst the Atlanta University Center institutions, and the center continues to share a library to this day.