"One song of your life"?
I don't know what that's supposed to mean but I have a few that really touched me at some points in my life.
Just can't choose between these songs to be that "one song".
A Whiter Shade Of Pale - Procol Harum.
You Light Up My Life - Debbie Boone.
Save Me - Queen.
With Or Without You - U2.
I Can't Make You Love Me - Bonnie Rait.
Angel - Sarah McLachlan (I get turned on by her voice .... )