SJ visualised the scene and amplified the message conveyed by the words, by adding appropriate music pieces.
In ‘Anari’ songs, you can see this clearly. In Sub kuchh seekha, Raj is speaking his heart out at feeling ‘cheated’ by a rich girl pretending to be poor. But he is a civilised man and will not shout. The song is very mild, the notes are limited. But the emotional upheaval is expressed by the violins section and the complex accordion piece, which run across two octaves.
Similarly in Dil ki Nazar se, Raj is too timid to say out his love openly. So while the song is soft, the interludes are quite aggressive, particularly the M2 accordion piece goes against the soft grain, and the following ascending strings further convey what the words left unsaid.

By Chandu Kale