Katy Perry's "Roar" jumps to the top of the U.S. Spotify 50 with close to 2 million plays. In the UK, Avicii tops the chart. The Spotify Top 50 is the most-streamed songs of the previous week, market-by-market. The Social 50 is the most-shared songs – those that have been most shared with other Spotify users, including via Facebook and Twitter. The Spotify Charts:
