Thinking about this, it ain't easy...
However there are a couple of songs I can almost hear Macca sing..
Don't Let it Bring You Down by Neil Young (maybe NY could do Macca's song of the same title from London Town, haha);
and Something so Right by Paul Simon. A bit random? yeah, but hey why not?
Oh, and Where are We Now by Bowie...great song, and one where Paul's careworn voice may well excel
So I stood with a knot in my stomach,
And I gazed at that terrible sight
Of two youngsters concealed in a barrel,
Sucking monkberry moon delight.