Yes, found it http://www.digitaltrends.com/music/spotify-raises-1-billion-...

"Investors, according to the Wall Street Journal, will be able to convert the debt into Spotify shares at a 20 percent discount if the company has a public offering in the next year, with that discount rising two and a half percent every six months Spotify doesn’t go public.

Until then, Spotify will also pay a five percent interest rate on the debt. That’s an amazing investment for those who were given the opportunity to make it — five percent on their money up front, and a huge discount on stock when Spotify goes public. Essentially, if Spotify doesn’t immediately go under, they stand to make a lot of money on their initial investment no matter what happens."