Spotify subscriptions pump up revenue, but operating loss widens

By Mia Shanley and Sven Nordenstam STOCKHOLM (Reuters) - Spotify's revenues rose 80 percent in 2015 as it gained more subscribers for its music streaming service, but heavy spending on product development and international expansion meant a bigger operating loss. The privately-owned Swedish firm, global market leader with more than 30 million paying users, is facing tough competition from others such as Apple Music and Alphabet Inc's Google, which offers YouTube and Google Play Music. Filings ob