Remember Rdio? It’s the mysterious new online music service being launched by Skype (and Kazaa) co-founders Niklas Zennstrom and Janus Friis. All they’ve said publicly is that Rdio will be a subscription based service, but TechCrunch has been digging around business site LinkedIn to see who’s working for the company. Its engineers come from Imeem, Songbird and browser firm Flock, while its COO is ex Skype and AOL. Meanwhile, the company is backed by investment firm Europay Capital Advisors.