Mine are all from the 1970s so apologies to those of us who aren't familiar with them. In no particular order, they are:
Just When I Needed You Most by Randy Vanwarmer
For The Good Times by Perry Como
The Last Thing On My Mind by Neil Diamond
If You Leave Me Now by Chicago
Where Is The Love ? by Roberta Flack and Donny Hathaway
Will You by Hazel O'Connor gets an honourable mention. Fabulous song, not quite a love song but not quite a power ballad either.