“Agar Tum Saath Ho” is not just a song, it’s an emotion; it has a sentiment of love and melancholy attached to it, it pacifies those who believe in love, and those who don’t. It is a song for the ones who are trying to let go, and for the ones who have, with all their might, have finally let gone.
It is a companion in those lonely nights as it hugs you in its music; and it is like that little ray of moon in those darkest of hours where you’re the most vulnerable, from where healing yourself seems next to impossible.
As the song starts, the beautiful lyrics by Irshad Kamil tend to bring you to a world which is so soothing, yet gives you a mental breakdown that can’t be healed.

Pal bhar theher jao, dil ye sambhal jaaye, kaise tumhe rooka karun ...
Even this first line beautifully describes the feelings of a lover- heart-broken yet composed, as it asks her beau to just stay, after all, what more can the heart ask for?
STAY- One simple word, but has the ultimate power to heal you of all the sorrows, of all the pain, and that feeling of struggle which goes on between the mind and heart every single moment.
Bin bole baatein tumse karoon, agar tum saaath ho ....
As the song proceeds, it eventually describes how easily a person just staying in life can heal you slowly, but efficiently. How, even with no conversations, a person can express the reason behind their melancholy, only with the presence of a heart that heals you.
The movie “Tamasha” describes a story where the protagonist Ved (Ranbir Kapoor) is not able to accept himself for what he is, and here is Tara (Deepika Padukone), who falls in love with that version of Ved, which he is not ready to accept himself.
When Ved says, “tujhe to pyaar ho gaya hai pagli, par kisi aur se...”, he tries to express his feelings through the fact that even he doesn’t know what has happened to that part of himself, which had dreams, and aspirations yet he is hurt that he can’t bring that version of himself, as for him, that version is hidden somewhere, from where there is no looking back.

“Teri nazron me hai tere sapne, tere sapno me hai naraazi, mujhe lagta hai ki baatein dil ki, hoti lafzon ki dhokebaazi...
Through these lines, Irshad explains Ved’s version of story where he thinks that Tara has dreams, those dreams where she has fallen in love with Ved, that Ved who loves the stories he creates, that Ved who is capable of living the life he wishes to live; yet those dreams have disappointment, because the life that Ved has accepted for himself is far away from what he desires to live. And that’s how merciless life actually is, isn’t it?

Tum Saath Ho, Ya Na ho... Kya Fark Hai... Bedard thi Zindagi, Bedard Hai ... Agar Tum Saath Ho..”
According to me, this one-line itself deserves a standing ovation for the manner in which it has been drafted. After all, life, as they say, never comes to a halt, and so does its teachings. People come, become the most important part of our life, and then leave, but life never halts.
With every second, we learn something which shall remain with us, until the very end, and that’s exactly what Kamil tried to depict through this gem of a line. And if life was merciless, it has remain so, whether or not someone we care about stays, or leave, the only difference is we learn to adjust with their presence and absence, both, sometime in life. 

So what is so great about Agar Tum Saath Ho?

Is it the beauty of the lyrics? Is it the pain in its music? Is it the portrayal of pain through its protagonists Ved and Tara? Is it the melodious voice of Alka Yagnik and Arijit Singh, or is it the melodious composition by A.R. Rahman Sir?

I don’t know, for a person who has her heart in this song, can choose one.
But, the way it expresses love and regret is a treasure. It might conflict, with the present idea of love, which roams around PDAs and gifts etc., but it sure does touch that string, which knows that love is much beyond all that.

It can become your go-to sad song (like it did for me), which reminds you of everything; you did for love, and everything you lost for it. It might have been written just for portrayal of Ved and Tara, but I feel it fits in your life, like an un-detachable cord.

So, for those vulnerable nights, where we don’t find an excuse to continue with our excuses, let’s give our excuses a new hope through bin bolien baatein tumse karoon, agar tum saath ho ...