Facebook has added another new music feature to its website, which sounds small but is actually rather significant. Artist pages on the social network now have a ‘Listen’ button added to their top menu bar. When clicked, it takes fans to the artist’s presence in whatever Facebook-connected streaming service they’ve used most – Spotify, Deezer, Rdio and so on. The services are taking different approaches to what gets played when a user arrives via one of these listening buttons. Spotify starts playing the artist’s five most popular tracks, for example, while Rdio fires up their artist radio station. The move is already creating some controversy among startups who’ve been providing artists with tools to have streaming music available on their Facebook pages. Here’s BandPages’ Matt Conn’s pithy reaction on Twitter: “Thanks Facebook. :(” BandPages, RootMusic and others have already seen plummeting traffic to their tabs since Facebook’s Timeline redesign for pages (Bulletin, 27-Mar-12).