Meter common rhythm and obsolete rhythm

The most exquisite and the greatest manifestations of our culture in our turbulent historical periods are the magnificent works in Persian literature reflecting all historical, cultural, social. psychological, aesthetic, and other aspects. To appreciate the value of these invaluable gems, we must scrutinize over the delicate and witty points and distinguish between the good well as bad aspects because our contemporary literature is the logical continuation of the past literature. In this regard, knowledge of different genres, history of literature, prosody, stylistics, mysticism, history of language, grammar, rhyme and rhythm, Radif, etc each provides a way for better understanding of literary works. Rhythmical language is an appealing subject for people, and some verses and musical statements remained from the time before Islam is an evidence of this. The evaluation of image laden language initiated from the time that a science or a craft entitled rhyme and rhythm was introduced. This article attempts to find a method for understanding the prevalent as well as obsolete meters, and it provides statistical samples form various poetic in the works of the seventh and the beginning of the eighth century famous poets.