Young people (13-35 year olds) listen to Internet radio in their cars, not the default option, AM/FM radio; Much of this listening happens via mobile devices (obviously); andThese data support Monday's contention that Pandora's Not Screwed, It's in The Driver's Seat. Despite the hype that surrounds Spotify, Pandora absolutely blows it away. To be fair, I don't consider the two direct competition, but popular memes claim Spotify has/will/might/could/someday should crush Pandora. As the discovery/personalization pioneer, the major Internet radio player and emerging sales alternative for advertisers, Pandora owns first-mover advantage. This matters more in the Web radio space than any other. No matter who you are. On the relatively low end, Slacker continues to make an impressive push aimed squarely at Pandora. It has upgraded its platform, added all sorts of content and gone on the advertising offensive against Pandora. While I admire the company's pluck, it shows a lack of focus. That's the other edge Pandora has that so many bears ignore -- focus.Of the Internet radio services available, the free version of Pandora (P) leads in popularity, with a 39% share of streaming music usage among ages 13 to 35. iHeartRadio comes in distant second with an 11% share, followed by the free version of Spotify (9%) and Grooveshark (2%). No paid music service had greater than 2% share.