No doubt Amanat sang exceedingly well but the reason why people cry whenever anyone sings this song (when Sameer sang the song in Little Champs, the reaction was the same) is that Gulzar has written absolutely soul-stirring lyrics!
Jeene ke liye socha hi nahin, dard sambhaalne honge
Muskuraaye to muskuraane ki karz utaarne honge
It was Ismail Darbar in his wisdom, who pointed out that the standing ovation was for Gulzar's lyrics which has relevance for every person listening to it.
Thanks Ismailji, you said just what my heart was screaming.