I wish that songs like this told real stories and they lived happily ever after... but as Tom Higgenson had said, "If we had lived happily ever after, then what would my next song be about?"
9 months late, but yeah, hes not a trained singer, he aint the best but hes certainly not the worst either you maybe dont like his tone but he is perfectly on pitch, yeah false notes exist but thats what makes this song special, you get the feeling that hes sad cause of delilah
i think that in the studio version he is only singing o he is not singing and playing guitar at the some time. play guitar and sing its a very difficult task, and some singers use to sing worse when they have to play guitar at the some time