Summer isn't just the silly season for newspapers, it is for charts too, with fewer big name releases being made available, and consumption of music - including streaming - falling. With demand weak, charts are volatile.

Two facts emerge this week that prove the theory. Firstly, Adele's latest album 25 - released 94 weeks ago - is No.1 on iTunes in more countries (17) than any other album despite the fact she isn't touring and hasn't had a single out ...