That, imo, is a great call
How do you define "Pop" Music. For me neither Bob Dylan or Pink Floyd would count.
Single - Heartbeat - Buddy Holly
Album - Out of the Blue - The Electric Light Orchestra
Thread title IS a bit misleading as I was thinking of best POP song but basically best album of any genre. I'd also argue that Like a Rolling Stone is a POP song, it spent weeks, months even in the pop charts in the USA and here. There are plenty of fantastic singles of the 60's and early 70's that couldn't be included if you are thinking of Pop as something trite, happy and catchy.