Personal Radio gives you an insight into a user's entire profile. This station's content is built up based upon every song that the user gets scrobbled to their profile, via a plugin or the radio service.Anyone can listen to the personal radio of another user, however, to listen to your own radio station you'll need to subscribe.
The list of artists which you may see on an artist page as being "similar" is based exactly on our user's listening habits. If a lot of users listen to Artist X, but also Artist Y and Z - Y and Z artists will become similar to X.With a few added constants and other functions thrown into the equation to help make it more accurate, you'll find that's how Similar Artists are made.
http://www.last.fm/help/faq/
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Creating Personal radio stations online are a way of estimating individual utility curves by giving the user option to rate songs, skip or listen to similar songs. The understanding of each user preferences is ultimately the goal for services such as Last.fm and Pandora. Building the model according to the specific music genre details and evaluating the weight of each of the elements as part of the recommendation is an example of a decision making problem. The model is contunually updated and becomes more precise with usage and voting. A good background calculation is needed to evaluate and recommend songs based on the similarity of the artists, the type of the genre preferred by each user and fitting the user utility preference to an already known function for users with similar preference types.
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