What do we call a collection of plays, dances, or pieces that a performer or company is familiar with?

The term used to describe a collection of plays, dances, or pieces that a performer or company is familiar with is "repertoire." This concept encompasses not only the works that a performer can present but also those that they have practiced and can execute with proficiency. The repertoire serves as an essential foundation for a performer or company, indicating their range and versatility in their craft.

Dancers, musicians, and actors often build and maintain a repertoire that reflects their training, interests, and the types of performances they wish to offer. Having a diverse repertoire allows performers to adapt to various styles, themes, and audiences, showcasing their talents effectively.

While "catalog," "dossier," and "library" can imply collections of materials or works, they do not specifically connote the idea of familiarity and performance readiness that defines a repertoire. A catalog may refer to a list of works without the nuance of performance capability, a dossier may relate more to documentation and records, and a library typically suggests a collection of texts or materials rather than a focused set of works for performance. Thus, repertoire is the precise term that encapsulates the relationship between familiarity and performance.