“More than 40m people currently pay to subscribe to a music-streaming service, and this number is increasing by 50 per cent each year. Outstanding questions about low royalty payments to artists persist, but for the customer, at least, the value proposition is obvious—for $120 a year, you get everything. Streaming services are pricey, but once you’ve subscribed to one, you know there’s no going back. Of the original subscribers to Spotify’s first premium offering in 2010, 70 per cent were still enrolled after four years.”