The Beatles and their Rubber Soul album showed the world that the fab four were starting to take their music in a new direction. It hit the #1 position on the charts this week in 1966 and would stay there for a month and half.

Quoting from beatles.com, George Harrison had this to say about the collection... "We were getting more fine tuned really. More of the same, but fine tuning it. I mean we certainly knew we were making a good album, then."
This video gives you an idea of where The Beatles were coming from.

The Beatles via YouTube