I will sing nearly any given song one could desire as a serenade or, if preferred sing from my own set of songs which include songs by Dean Martin all the way to more modern songs by Vance Joy and the likes in between.
I am a lower Baritone/Bass (although some higher tenor notes I can manage)
On some of my personal set-list of songs (and if lucky, requested songs) I already know some of the notes for guitar on them and so may be able to accompany myself.