The online music retailer eMusic has put out some interesting data that, it is claimed, supports the famous “Long Tail” theory of online retail. Chris Anderson (picture), the editor in chief of Wired magazine, coined the phrase in a 2004 article, claiming that Internet retailers would sell more niche products at the expense of mass-market items. However, this theory was challenge in a recent study by Will Page and Andrew Bud, which claimed more than 10 million of the 13 million music tracks available on the Internet failed to find a single buyer last year. In response, eMusic has reported that 75% of the tracks in its catalogue were bought at least once in 2008.

Here’s the next trend to study: Free. This is a video of Chris Anderson discussing his next book. Chris is the editor of Wired and author of The Long Tail. Kudos to whoever at Nokia decided to put this keynote online for the rest of us. And kudos to Core77 for finding it via Nova.