eagle,
When I see the definitions you had quoted "Eclecticism and freedom of expression, in reaction to the rigidity and aesthetic limitations of modernism, are the hallmarks of the postmodern influence in musical composition" ,
Wouldn't using the bass guitar and various guitar chords in a Tamil folk song constitute eclecticism? Wouldn't they not be beyond the aesthetic limitations of the Tamil folk genre? Wouldn't using western vocal harmonies, as he did in Devar Magan, to create a complete folk song experience be termed as eclecticism? Wouldn't introducing Carnatic ragas within the rigidity of western classical music classify as post modernism?
To me Raja has been the ultimate in experimenting in film music. The problem is that he fuses all these elements so well that many people do not recognize this. One person hears it as a folk song and another hears it as a carnatic piece and another hears the guitar chords. Every experiment is in the service of the song. My personal opinion is that this type of fusion to give an organic whole is far more difficult to achieve that many other types of fusion. Lot of classical musicians have tried it but in my opinion I really did not see much fusion out there but only two strands playing simultaneously.