Localytics, an app analytics and marketing company, crunches a lot of numbers. They took stats from the last year and looked at "time in app" as a metric for comparing app categories. Music apps outperformed between August 2013 and August 2014 with a 79% increase in time in app. This growth likely reflects the overall shift towards greater use of mobile apps with music leading the way. Localytics say they currently reach "25,000 apps, 1.5 billion devices and 50 billion data points monthly." From that wealth of data they took a look at the last 12 months: "For this study,...

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