My most requested have pretty much been covered here and most similar to Tom Cavanaugh's. But there is another category of songs that almost always work really well...those that are forgotten favorites..or re-arranged hits to fit the predominant age of the audience.

Some forgotten favorites:
Meditation (one Sr. lady once requested it but called it "Medication".)
Volare
Cab Driver
Teach Me Tonight
Blueberry Hill
Changes in Latitudes
Wind Beneath My Wings
L-O-V-E
Your Momma Don't Dance
Gimme Three Steps
Takin' Care of Business
I Just Want To Dance With You
....just a few...but there are many more that I will do right after the dreaded request for a Tango or specialty dance that appeals to a minority.
Eddie