The arts and music are integral to the Waldorf curriculum, not an ancillary extra- or co-curricular activity. Each grade performs a class play borne out of a major curricular theme of that year. A class may also explore subjects through painting or singing or writing a poem in addition to more conventional methods. Throughout Waldorf education, students create personal main lesson books, bringing their own writing and artistic expression to subjects ranging from history to literature to math. All students learn to play an orchestral instrument and perform in vocal and instrumental ensembles. They also learn eurythmy, a movement art unique to Waldorf education. In a Waldorf school, traditional academic subjects are learned through the arts, and the arts are as prominent as traditional academics.