Just a few that get to me are:
Nessun Dorma preferably by Jackie Evancho but also by Pavarotti
Blue Eyes Crying in the Rain by Willie Nelson
I Want to know What Love IS by Foreigner
I Can't Help It by Hank Williams
Sweet Dreams (about you) by Patsy Cline
In Dreams by Roy Orbison
You ought to check out Wynona Judd's version of I Want To Know What Love Is. Her mother and sister and numerous familiar faces were in the audience and they were all just a boo-hooin'. She puts a lot of power and a lot of hurt in her version.