Plum,
I generally consider the ever increasing melody in the charanams as one of the major hallmark of Raja's great songs. This is quite unlike many of the other MDs, who either come up with some very melodic stuff and maintain it throughout or come up with a lovely pallavi only to bring it down in the charanams. I was listening to 'Kadal Katrin' from Malayalam 'Friends' today and this thought passed through my mind, especially when Jesudas goes to the high pitch during the charanam, "Angakale". What a build up!! Maybe Usha should post this song one of these days.