My favorite is "Sister." I don't know if any other chapters sing this, I've only heard of one but we sing it every year at pref. (well, three girls do)
Here goes:

Sister, I'm crying, it must be this rain. We've grown up now so suddenly, the realizations are haunting me. But sister, it's cold out, and I'm afraid it's time, that we must leave each other, there's a new life we must find. But we have something in common and a love we can not hide, cause we are sisters in Alpha Delta Pi, and we know that thru the years, our love will never die, cause we're bonded, ALpha Delta Pi
Sister, the years have, been so good to you. It's been a while since I've seen your face, that smile of yours was so hard to replace. But sister, you're so happy, and I can see it's true. HIs eyes look like his daddy's, but when he smiles I see you. We had something in common then and the same holds true today. Cause we are sisters and in our hearts the love will stay, and we know that thru the years, our love will not die cause we're bonded, Alpha Delta Pi.
Sister, we're grey now, but when you smile you shine. Our children all have moved away, but I just got some news today. My daughter has something in common now and a love she can not hide, cause she's a sister in ADPi, and thru the years she knows a love that can not die, cause she has watched you and I.....Cause we have something in common and a love we cannot hide, we are sisters in ALpha Delta Pi and we know that thru the years, our love will never die, cause we're bonded, ALpha Delta Pi, Alpha Delta Pi.

I'll never understand how we had three legacies on the front row go Theta after hearing this song. (No offense to my KAO friends out there, yall are stinking awesome!) Oh well. I want this one or Pass it On sung at my wedding. Probably this one. What do yall think?

Oh geez, I've started to cry. If any of you Zeta Chi girls are on here, I LOVE YOU!!!!!! Hopefully you've found a new rush nazi to take my place by now.