What is the "Y" symbol next to the track name mean?

The “Y” symbol is the default avatar (for “you”). When Tomahawk resolves to a local track it displays the user avatar - which is the "Y" unless you have logged in to a Gmail or Jabber account in Preferences (in which case it will your the avatar from that service).  

For example, if you are connected to friends (via Jabber or Gtalk), it would display their avatar if you are streaming the track from their library.

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