It disturbed me that the music industry had gone down the drain, even though people were listening to more music than ever and from a greater diversity of artists.

With Spotify, people don't get it until they try it. Then they tell their friends.

With Twitter and other social networking tools, you can get a lot of advice from great people. I learn more from Twitter than any survey or discussion with a big company.

In general, people are comfortable sharing their music. There are two exceptions, though - Lady Gaga and Britney Spears.

The value of a company is the sum of the problems you solve.

I had two passions growing up - one was music, one was technology. I tried to play in a band for a while, but I was never talented enough to make it. And I started companies. One day came along and I decided to combine the two - and there was Spotify.

In order for a service to be social, you've really got to start from the ground up. The fact that almost a third of the U.S. population have even heard of Spotify is really because they've seen it on Facebook and friends have been sharing.