
Sowmya's well-demonstrated talk was about how every raga had a characteristic phrase or a gamaka or a pattern that you had to return to time and again to establish the raga. Sriram laid out a bunch of what he called operating principles ("dhatu" or skipping swaras (like from sa to dha in the Hindustani Bhatiyar), varja swaras (both scale-defined like in audava ragas like Hamsadhwani, and varja prayogas like skipping panchamam in Carnatic todi), vakra prayogas (as in Hindustani raga Nand), asymmetry in ascent and descent (like in the Carnatic Mohanakalyani). What was amazing was both artistes' ability to sing (or play, sometimes, in Sriram's case) snippets of ragas or swaras at will - to illustrate these principles. Both sang without any accompaniment at all.
One interesting difference of opinion between the two artistes - Sowmya said her guru had advised her to never leave the audience guessing about what raga she was singing, by singing the signature phrases right at the start of an elaboration. Sriram said often there is scope for creating additional enjoyment of a raga rendition, by keeping the audience guessing for a bit between X and Y, and then suddenly using a particular prayoga to establish that it was X. Sowmya also described how her guru, the late Dr S Ramanathan would make his students sing swara passages in allied ragas (I think she talked about Kedaragowlai and Narayanagowlai in that example) in succession so as to enhance their appreciation of what made the two ragas distinct.
The Hindu has a nice review of the Sowmya lecdem http://www.thehindu.com/arts/music/gram ... 244990.ece.
Just realized after first posting this: the honourable Sanjay Subrahmanyan had (in June 2009) this to say about rakthi ragas" http://sanjaysub.blogspot.sg/2009/06/sc ... akthi.html. Indeed, Sriram's sort of justified his view that all ragas have rakthi potential, by saying that rakthi comes from connecting the audience's memory structures to a particular rendition - as an artiste, he said, it is when you are able to touch those todi chords, or sankarabharanam nodes in the rasika's minds - that you are able to create rakthi.
I wonder how forumites feel when an artiste is elaborating at length on a relatively unknown raga - isn't it kind of difficult to appreciate the artiste's efforts as much as when they are singing a well-established raga? Or are some ragas such that even with no prior acquaintance with it, one can still immediately appreciate the bhava in a rendition?