Leaked documents obtained by Music Ally have revealed that Spotify, by reducing its free access tier to 10 hours of music a month in May, saw a dramatic upswing in premium subscriptions. Between March and June, Spotify lost 1.6m regular users on the free tier but added 520,000 paying subscribers. Premium users now account for 32.9% of its active user base. It has 1.23m subscribers on its top tier (?9.99/EUR9.99 a month) and 303k on its PC-only ad-free tier (?4.99/EUR4.99 ...