This is a big week for German social sound platform SoundCloud. TechCrunch points to the service's new updated interface, which you can see by applying for their private beta test (I applied but haven't gotten access yet). SoundCloud is updating its tradmark waveform music player, as well as more social features, further focusing on its already excellent user experience. In other news, the site recently passed 15 million users, according to Billboard. It's great to see a successful music service be so committed to making its users happy.