In the MC 14.0.71 or above, you'll find a "Performer Store" link. It's the store we introduced a year ago as a separate player for subscription and download purchases. In the latest builds, it also has music video content.
Without a subscription of any kind, you can play 30 second samples to find music you like. The "Similar Artist" feature and the artist bios are a good way to discover new music.
It's based on the MediaNet library of 5,000,000 plus tracks. It's the same content that the major labels license to Napster, Real, and others. MediaNet is also the provider of content for the Zune service. For more than 5 years, we've made many of the players that their customers use.
The first time you click on the link, MC will download the library of albums and artists (no content) to make searches very quick. You will experience a delay of 30 seconds or so when this happens, but only the first time you run it.
There is a free 12-day trial period. Other terms are described on the
Performer MC page. There is also a limited free player for Performer there, but the MC14 player is newer and much more capable.
If you don't want the store, you can remove it in Plug-in Manager by selecting it and clicking on "Hide".