Swedish music-streaming service Spotify now has one million paying subscribers across Europe.

The online music site offer a free service, which is known as Spotify Open, and allows web users to stream 20 hours of music per month, although the tracks are peppered with adverts like commercial radio.

However, there are two subscription-based services: Unlimited, priced at £4.99 per month, which lets web users stream as many tracks as they like without adverts; and the £9.99 per month Premium service, which offers unlimited ad-free streaming along with access to Spotify from mobile phones.

"It's with a sense of real pride and excitement that we can announce a new milestone today, having welcomed our millionth paying subscriber to the service," CEO Daniel Elk said in a blog.

Spotify, which has 6.67 million users, is currently only available in Sweden, Finland, France, Norway, the Netherlands, Spain and the UK. However, the company is preparing to launch in the US and has secured some £100m in funding to complete this move.

See also: Spotify has 320,000 paying users