To understand the impact of Ilaiyaraaja’s music in Aan Paavam, we contrast it with Pride and Prejudice (1995), which takes the opposite approach towards the music.
In Pride and Prejudice, the fun is in making the audience wonder about the inner meanings behind the dialogs. All the focus is on the dialog, and music is kept to a bare minimum (during titles and major scene changes).
In Aan Paavam, the music plays a crucial role, taking a love theme, and varying it throughout the movie. The background score acts like a narrator. But when music is a narrator, it doesn't have to use words like a human narrator. That leaves the option open to the viewer, to give their interpretations to the narration. A human narrator would have to be very specific.