Last.fm Radio will require a subscription fee. Nothing will change in the United States, United Kingdom and Germany.

From Last.fm blog

We’re announcing an upcoming change to the way Last.fm Radio works in some parts of the world. In the United States, United Kingdom and Germany, nothing will change. In all other countries, listening to Last.fm Radio will soon require a subscription of €3.00 per month. [...] Everything else on Last.fm (scrobbling, recommendations, charts, biographies, events, videos etc.) will remain free in all countries, like it is now.

Since [...] 2002 we have focused on playing the right songs to the right people, compensating artists for playing their music, and being the best music site on the web. [...] We’ve built up the largest catalogue of any web radio platform: over 7 million tracks are available on Last.fm Radio stations.

In order to keep providing the best radio service on the web, we need to ask our listeners from countries other than USA, UK and Germany to subscribe for €3.00 per month. In return you’ll get unlimited access to Last.fm Radio, and a promise that we’ll be hard at work improving the service for years to come.