Qat'aa, a form of poetry, is a part of soazkhwani / mersiya-khwani. Qat'aa is also known as Ruba'ee and performed before marsiya-khwani. When Qat'aa, Ruba'ee, Soaz, Salaam and Marsiya are performed combined it is called soazkhwani / marsiya-khwani.
References
Qat'aa Wikipedia(Text) CC BY-SA