C'est le plus grand succès commercial du groupe. La chanson est no 1 dans plusieurs pays (États-Unis, Canada, Royaume-Uni, Irlande, Pays-Bas, Australie, Afrique du Sud).
If You Leave Me Now est une ballade soft rock interprétée par le groupe de rock américain Chicago, écrite et composée par l'un de ses chanteurs, Peter Cetera. Sortie en single le 31 juillet 1976, elle est extraite de l'album Chicago X (en).

If you leave me now
you'll take away the biggest part of me
No baby please don't go
And if you leave me now
you'll take away the very heart of me
No baby please don't go,
no I just want you to stay
A love like ours is love that's hard to find
How could we let it slip away?
We've come too far to leave it all behind
How could we end it all this way?
When tomorrow comes and we both regret
The things we said today
A love like ours is love that's hard to find
How could we let it slip away?
We've come too far to leave it all behind
How could we end it all this way?
When tomorrow comes and we both regret
The things we said today
And if you leave me now you'll take away the biggest part of me
No baby please don't go, no baby please don't go
Oh girl, I just got to have your lovin, yeah
No baby please don't go, don't go, don't go