I could list about 50 Beatles songs that don't really "rock," but "Yesterday" is the most commonly known one. Sure, but there are a handful (or more) that do and you were careful to steer clear of them. That's my point. Isn't that what you do in an argument thought, try and prove your point? You surely don't want to give evidence to disprove your point and make your opponent correct do you? If somebody doen't think, on the whole, that the Beatles rock, they are not going to cite the songs that do rock but are going to cite the songs that don't rock (and usually the more famous songs) to prove their point.