To be performed by two persons. Performance to include same type of material as a solo with additional responsibilities on:
From the USTA Information, Procedures, and Rules, Tenth Revision"
Two contestants performing at one time are called a duet. Contestants are judged on their ability to perform simultaneously and in concert with one another while employing exchanges and combinations uniquely designed for duets. Each contestant is evaluated on the use of one baton. No credit is given for two batons.
From the NBTA International 1995 Rules Handbook"