Pink Floyd shocked the world with the release of their politically charged studio album, 'Animals', which arrived on this day 48 years ago.

On its 49th anniversary, we explore why Pink Floyd's 'Animals' remains one of the greatest and most underrated concept rock albums of all time.

Thus, Pink Floyd had a lot of momentum to maintain. And as anyone who has perused vinyls at a record shop can attest, an intriguing album cover can make or break a sale. After a few initial ideas ...