Editor’s note: Philip Inghelbrecht is a co-founder of Shazam, investor in 8tracks, and a paying Spotify subscriber. Of all industry roller coasters, the music industry must be the wildest. The last 30 years reshaped the business in a way we never could have imagined. Music as a product changed dramatically (e.g. from LPs to MP3s) and the ups and downs in worldwide sales would make the most hardened theme park visitor queasy. Nonetheless, we have yet to experience the biggest switchback on this rollercoaster ride. The clues for what’s around the next turn lie in a sister industry — movies. Let’s start by taking a look at the music industry. According to the IFPI (International Federation of the Phonographic Industry) revenue peaked at $38bn worldwide in 1999, collapsed down to $16 billion (2011), edged up somewhat the year after, only to fall back down again to $15 billion last year (2013). The transition from analogue to digital played an important role in all of this: it m...