Notating a piece in the key of Cb Major would be a bit silly, though, since just about any musician on earth would find the equivalent B Major easier to read.

And a note to the maintainer of the site: major keys aren’t any more “harmonic” than minor keys, and these key distributions don’t tell us anything about how “poppy” the songs sound. “Please Please Me” has an abundance of songs in E Major, sure, but E Major doesn’t sound any “poppier” than any other major key. What this really tells us is that the Beatles’ guitar chops weren’t as advanced as they would become, so they wrote most of their songs in keys that are easy to play on the guitar.

It actually says B/Cb. And while it sounds odd and counterintuitive, the key of C flat does exist in music theory.

one small correction… the “song keys” graphic maps the keys of songs on each album; it doesn’t directly show information about what songs are in what keys. so i believe you actually cannot use it to see the “poppier, more harmonic numbers”, on the poppier, more harmonic albums.

cheerio.

[Thanks for the correct - David!]