If they launched a subscription music service Ping could actually be useful. One of my biggest complaints about Spotify is that it sucks for music discovery, and that's should be one of its strengths given its social media ties. 10 years ago Steve Jobs was right... people wanted to own their music, not rent it. The market has changed now though. The iPod has become the iPhone and everyone has 3G and iCloud, so a subscription service is far more practical than it used to be.