They began almost in a banal fashion. Love Me Do is a shite, plodding song. But their evolution was astonishing. Please please me - their second single - is fantastic. Their B-sides, stuff like There's a place and This Boy just showed a band in artistic lift-off.
And once they reached their mid-period zenith they reached a place no-one else has ever touched. The quality of the music, the lyrics, the conceptulism, the audacity, the wit, the production.
I still find to listen to songs like I'm Only Sleeping, Yesterday, Tomorrow Never Knows, I am the Walrus, The Long and Winding Road (though strictly the Naked version, not its Phil Spector Let It Be travesty) to be an astonishing experience. They sound almost too perfect to be true.