दो लफ़्ज़ों की है, दिल की कहानी

"The tale of [two] hearts, is made of [only] two words ... love or youth."

If you interpret love or youth to mean true love or infatuation, you can see some justification in this simplified interpretation. It is said that Asha Bhonsle herself regards this song as one of her best renditions.

आनेवाला पल जानेवाला है

The brevity of time and hence the importance of 'living in the now' is elegantly expressed in this 1979 Kishore Kumar number from गोलमाल.