Oooh thats a toughy, I dont really know.
I know what songs I like and remind me of Elvis, which are Black Velvet and Walking in Memphis, I know they are both about him and thats why it springs to mind but I love them none the less.
The main one I love, which makes me sad as well is ' I will always love you' sung by Dolly Parton. Elvis really wanted to sing this song but she turned him down after discovering that she would have to sign over half of the publishing rights for the song
He would have sung it beautifully