The Beatles – Revolver (1966):  It is a tough choice, but Revolver is probably my favorite Beatles album, and I am certainly not alone in feeling this way.  While the Beatles had not officially retired from holding live concerts – a rare decision, since most rock bands cannot make a living solely on record sales – many of the songs on Revolver would be difficult if not impossible to satisfactorily perform live, due to the astounding experimentation and innovation that took place throughout its 11 tracks.  The closing track, “Tomorrow Never Knows” was actually the first song that the Beatles worked on after taking several months off from recording and touring.  Even a half-century later, “Tomorrow Never Knows” is startling in its breadth and audacity – for my money, the equal of any of the songs on the Sgt. Pepper album or The Beatles (the so-called White Album).