"If You Leave Me Now" is the title of a popular hit ballad by the American rock group Chicago, from their album Chicago X. It was written and sung by bass guitar player Peter Cetera and released as a single in July 1976.
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If you leave me now,
You'll take away the biggest part of me.
Ooh.... no baby please don't go.

And if you leave me now,
You'll take away the very heart of me.
Ooh.... no baby please don't go.
Ooh... God, 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
then will both regret
the things we said to-day

Ooh girl, I just got to have you by my side.
Ooh no baby please don't go.
Ooh mama, I just got to have your love, yeah
We've come too far to leave it all behind