In playback singing, feeling is an important factor. which songs overwhelm you with emotion - any emotion. I would list some-
babul ki duaen(mohd. rafi- neelkamal)- tenderness.
ye mahlon, yeh takhton(mohd. rafi- pyaasa)- despair
rasik balma(lata m- chori-chori)- longing
meri bhains ko danda(manna de)- mirth
jaayen to jayen kahan(talat mehmood)- despair
yeh kya jagah hai doston(asha bhonsle-umrao jaan)- sadness
aa ab laut chalen(lata,mukesh-jis desh...) urgency
In more recent times, it's quite rare that a song really touches you. a few i found with lots of feeling:
ae ajnabi(uditnarayan-dil se)-longing
ek ajnabi sa ehsaas(lata,adnan sami)-innocence.
The list is long. would you like to contribute your own favourites?