Starting from the earliest known work Tholkappiyam (500 BCE), there are several references to music and Panns in the ancient pre-Sangam and Sangam literature starting from the earliest known work Tholkappiyam (500 BCE). Among Sangam literature, Mathuraikkanci refers to women singing sevvazhi pann to invoke the mercy of God during childbirth. In Tolkappiyam, the five landscapes of the Sangam literature had each an associated Pann, each describing the mood of the song associated with that landscape. Among the numerous panns that find mention in the ancient Tamil literature are, Ambal Pann, which is suitable to be played on the flute, sevvazhi pann on the Yazh (lute), Nottiram and Sevvazhi expressing pathos, the captivating Kurinji pann and the invigorating Murudappann. Pann(Tamil: பண்) is the melodic mode used by the Tamil people in their music since the ancient times. The ancient panns over centuries evolved first into a pentatonic scale and later into the seven note Carnatic Sargam. But from the earliest times, Tamil Music is heptatonic and known as Ezhisai (ஏழிசை).[25]