Internet streaming sensation Spotify has released its latest figures, one of which is that it now has 4 million paying customers. The music service has been a massive hit ever since it was released, and these latest figures show just how big it is. Spotify's Ken Parks, speaking at a panel in the Global Business Summit on Creative Content in London, updated everyone with the running totals.

Talking to a 'Future for the Music Industry' panel, Parks announced that Spotify now sports 15 million active users, of which four million are willing to pay for the service. Spotify is a massive competitor to Apple's iTunes and is popular with users who don't want to be locked into an ecosystem as Spotify is multi-platform.

Earlier this month, it was announced that steaming accounts for 89% of music sales in Spotify's home market of Sweden. Parks will be looking for subscription numbers to increase as more countries start to become comfortable with music in the cloud. Based upon the numbers from Sweden, it appears people already are, at least in that country.