Don listens to The Beatles’ “Tomorrow Never Knows” at the end of “Lady Lazarus,” (Season 5, Episode 8).

“When did music get so important?”

Don’s question to Megan on this week’s Mad Men is one all our grandparents must have asked, and the answer is an in-joke to music snobs everywhere: right now. That is, 1966, the year when four of the greatest albums in the history of popular music — Blonde on Blonde, Face to Face, Revolver (central to this week’s “Lady Lazarus” episode), Pet Sounds (featured prominently in “Far Away Places,” i.e. the Roger acid trip one) — were released within four months of each other.

If Mad Men was going to splash $250,000 for one Beatles song and one only, it couldn’t have chosen better than “Tomorrow Never Knows,” maybe the greatest closing track in the history of pop (sorry, Prince), which, despite not being heard until the end, was Sunday’s thematic centerpiece. Listen to Revolver today. You can try to deny it in an attempt to seem less obvious, you can point to a lot of other groups that are just as important — but, really, can you say anyone did this any better?

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