Kovalan and Madhavi bathing in Cauvery Sangamam ( Can't say whether this is a refernce to Aadip perukku - Hence please only consider the beautiful song alone)
திங்கள் மாலை வெண்குடையான் சென்னி செங்கோல் அதுஒச்சிக் கங்கை தன்னைப் புணர்ந்தாலும் புலவாய் வாழி காவேரி. கங்கை தன்னைப் புணர்ந்தாலும் புலவாது ஒழிதல் கயல்கண்ணாய். மங்கை மாதர் பெருங்கற்புஎன்று அறிந்தேன் வாழி காவேரி. 2
Salil Chaudry set music for this song and was rendered once by Jesudoss and then by Susheela. It was recorded for a film called Karumbu, unfortunately the film never got released. The song is available on the net, good one.
Kanal Vari - is the climax for silapathigaram. The event post this is just a conclusion of the epic.
In the movie Agathiyar - Seergali Govindarajan sings a song. Only the first line is Nadanthai Vaazhi Cauvery" rest is modern The story of Cauvery coming from Agasthya's Kamandaloo is also mentioned is either Silambu or Manimekalai. ( The line is something like Karakam kavizh..) any one remembers?
செங்கதிர்ச் செல்வன்: Sun God திருக் குலம் - His Decendants - meaning Cholas. So traditionally Cholas were believed to have been Sooryavamsis. This is much much earlier to Anbil plates. The story of Vinayaga coming in the form of a crow and releasing Cauvery from the Kamandal of Agasthya - Also an older story - thet too in a Bhudhist Text