Its kinda like how Launch.com seems to work. You select a number of your favorite artists. And based on that, it'll throw in a few "lesser known" or unselected artists. You can rate them (between 0 - never play it again to 100 - 'I love it!') and based on that it'll select more artists with similar music. Very good for artists that want to be heard over what the media spoon-feeds listeners.