It was (Kisho)rendered by Kumar

Aur Kaun? released in 1979.

The only song from the film in my collection was Haan Pehli Baar.

No prizes for guessing that Mr Kumar (Kisho)rendered it.

That track, again, was one of those radio regulars – I have heard it a number of times, but I had to look it up online to find out what I did not know about it.

And that was, of course, the names of the person who wrote it and the one who composed it.

By the way, Amit Khanna was the lyricist, and Bappi Lahiri was the composer.