It is not always senti-oriented alone, some of that music is simply non-recreatable
This is way off topic, but, I often wonder how it'll be to match up the modern recording technology with the creativity in some of these old numbers. The goal should be to have the same singer, identical orchestration, but much better sound engineering.
The hard part may be to stay loyal to the original track. With the exception of SPB, none of the singers of that era is in good vocal shape. (Even SPB may not be able to recreate his boyish voice).
That should show the kids who think AR Rahman is the only one. (Never mind, that was flippant). But the point is that most of the new numbers need a good sound system and all the audio wizardry to make them listenable.