Both of these were songs we used in a slide show during the 90's. Every time I hear them I think of recruitment

Forever Young Alphaville
Still Haven't Found What I'm Looking For U2

Both these songs have been sung during preference at one time or another with word changes.
Friends by Michael J Smith
This is the Time to Remember Billy Joel

This is a song my Chapter sung during recruitment and serenades.

California Dreaming Mamma and The Papa's

And the chapter I advise used this in a slideshow last year. Ha! They've also used "Suddenly I See" many times (someone mentioned it upthread).

It was popular on my campus to change the words to popular songs and use those as entrance songs. We used "Escape" by Enrique Iglesias until my sophomore year, and then my roommate did a re-write of "Crazy Game of Poker" by OAR that was a huge hit.

And both my chapter and the chapter I advise use a re-write of "Lullabye" by Billy Joel for pref.

We tried to use a rewrite of Pussycat Dolls "When I grow up," but the chapter voted it down. I've since forgotten most of the words, but my favorite were always,

"Host Speed Read, frat boys know me,
Number 1 SRAT when we step out on the scene!"

I know why they voted it down, since it didn't really work with our image, but I always liked it. Oh well.

These are Days- 10,000 Maniacs (the all greek slide show that was shown to all rushees during rush orientation)
The Rose- Pref
Any of the Brady Bunch songs- we did a Brady Bunch skit, so "It's a Sunshine Day" became "It's An AOII day" and "Keep on Moving" became "Keep on Rushing"