I’m sorry, but what does this have to do with the Pandora IPO? Well, Soundcloud is also soaring, just not on Wall Street (yet). The company just shared some astonishing growth figures with Digital Music News, including a userbase of 5 million. That’s a gain of 4 million (ie, 400%) in just one year.

On top of that, Ashton Kutcher and Guy Oseary’s A-Grade Fund has also stepped into picture with a ‘small investment’.

Sounds like Soundcloud is officially ‘so hot right now,’ though the presence of flashy celebrities is not always the greatest development.  Still, these user gains are happening for a reason.  About 20,000 new content creators, sound editors, and other collaborators are entering the site everyday, and that requires serious platform know-how to handle the load.