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Soundcloud, the Berlin-based startup founded by Swedes Alexander Ljung and Eric Wahlforss, has reportedly received a $50 million investment led by Kleiner Perkins Caufield & Byers including participation by GGV Capital. TechCrunch has estimated the round to be around $50 million, but Soundcloud did not confirm the round size in their press release about the investment.

Together with the investment Mary Meeker, partner at Kleiner Perkins Caufield & Byers, will take a board observer seat at the company. She is also active in other companies such as Groupon, Spotify and Jawbone among others.

GigaOM reports that Soundcloud has around 9 million registered users since its inception in 2007. The service offers music creators a way to share music in a social way that encourages interaction.

Alexander Ljung also gave an interview to GigaOm where he said that just the mobile apps have enabled around a million people to sign up for the service.

Before this round, SoundCloud has received funding from B-Round investors Union Square Ventures and Index Ventures as well as the A-Round investor Doughty Hanson Technology Ventures.

We covered the company in April 2009 when the company had just raised their 2.5 million euro A-Round.