Hey Bill,
What I do each year when the holiday rush calms down ( right about now, that is )is to peek at the Billboard charts for the last few years and see if there is anything I'm suited for on it.
For example:
1999-Smooth(Santana)
1998-Don't want to miss a thing(Aerosmith)
1997-Candle in the wind1997(Sir Elton)
1996-Becauseyou loved me(Celine)

Most of them are slow, I know .....

Some fun stuff from the 80s that gets requested alot:

1989-Living years(Mike & Mechanics)
1988-Never gonna give you up(Rick Astley)
1987-I think we're alone now/Mony Mony(remakes)
1986-Addicted to love(Rbt Palmer)
1983-Come on Eileen(Dexys midnite runners)

Some NONdisco 70s that work:

1974-Cant get enough(Barry White)
1973-Crocidile Rock(Elton John)
1972-Brandy(Looking glass)**HUGE
1971-Bobby McGee(Janis Joplin)