If you are a Hindi film music lover, you would have heard the song Neele Neele Ambar, composed by Kalyanji-Anandji and sung by the one and only Kishore Kumar for the film Kalaakar which came out in 1983.
In other words, Neele Neele Ambar, like so many other film songs, is primarily about the vocal melody or what we call the tune and the accompaniment and interludes are used to decorate the song. Whereas, in Ilaya Nila, the guitar arrangement is as important to the song as the tune. You could say that Ilayaraja writes music in such a way that the vocal and instrumental parts are inter-dependent and inter-connected while also following independent paths at the same time.
This element of a lot more going on in Ilaya Nila also comes out in how elaborate the structure of its antara is compared to Neele Neele Ambar. I will sing the antara of both quickly without the words and without repeating lines with the same melody.
The flute portion suddenly avoids all flats and sharps. That is, we are in C Major! It is this transition that paves the way for the antara of Ilaya Nila which is so intricate and covers so much ground where Neele Neele Ambar quickly returns to base camp.
So, to sum it up, what we can see is that Ilayaraja uses syncopation and accents to make you feel the rhythm without having to use a very heavy or loud percussion layer. Ilayaraja also builds an arrangement built around just a few instruments but which is extremely complex and in which the melody and arrangements are interdependent. And where Neele Neele Ambar sticks mainly to D Natural Minor, there are so many variations and changes going on in Ilaya Nila and it is the resolution of these variations or changes that makes the song so interesting.
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