Using data by Mixpanel, Apple Music seems to be quickly driving adoption of Apple’s latest iteration of its operating system, iOS 8.4. The chart shows that, in just one week, iOS 8.4 usage now makes up more than 40% of all iOS device usage. This is a rather staggering rate of uptake for a point-release. Clearly, the interest and advertisement around Apple Music is having an effect on update rates. Obviously, this only tracks OS adoption and says nothing about how well Apple Music itself is being received.