app_engine, with regard to "(AFAIK, the only song with total repeat of interludes is 'madhana mOha roopa sundari' of inRu pOi nALai vA - are there any others?)", two songs immediately come to mind where there was total repeat of interludes..."Pottathellam Kadhal thittam" from Singaravelan and "Thathom Thalanga" from Vetrivizha. I believe both of these have repeat interludes...I'm sure there are some more of them. I can't recall now, but even "Muthirai Eppodhu" from Uzhappali (lovely song, BTW, with superb vocal scale) might have repeat interludes.