When Syd Barrett left Pink Floyd, David Gilmour and Roger Waters quickly realised that their strength lay within the production of an album instead of the creation of singles. It took the lacklustre tune ‘Point Me At The Sky’ for them to come to this revelation, something that Waters himself looks back on and, unusually, calls a mistake. It was “one notable failure when Syd left the band,” he said. However, this failure needed to happen, as it…