Spotify Free vs. Premium: Should you pay to play?
spotify usa: Spotify planning to raise subscription charge, first time since 2011: Here's new pricing, key details - The Economic Times
How Much Is Spotify Premium and What Are the Subscription Options? - TheStreet
Audiobooks Just Got Cheaper—if You Know Where to Look - WSJ
What will Spotify's price rise mean for its recording artists and songwriters?, Music streaming
Here's How Long It Takes for Spotify to Make Money on Free Users
Address is not valid after trying to enter my ad - The Spotify Community
Spotify Premium price increase is now official
Spotify subscribers in the US now get 15 hours of audiobooks every month