Song:GUMSUM GUM GUMSUM HO KYU TUM For 30sec only?STRANGE

So,as usual i also went to see Paa with a lot of expectations and to say it came up to my expectations a bit less.The thing i hated badly was the song;
GUMSUM GUM GUMSUM HO KYU TUM.
I mean such a fantastic composition and it did'n found any place in the movie,just for 30sec its being played.It could be a well shot climax song which could be remembered when the audience leaves the hall.
BIG MISTAKE MADE BY THE DIRECTOR(its only my opinion,i am not questioning the capabilities and talent of any1)