def addToPlaylist(playlist,tracks)
      method = 'addToPlaylist'
      type = true
      args = {:playlist=>playlist, :tracks=>Rdio::keys(tracks)}
      return_object type,method,args,true
    end
def addToPlaylist(playlist,tracks)
      method = 'addToPlaylist'
      type = true
      args = {:playlist=>playlist, :tracks=>Rdio::keys(tracks)}
      return_object type,method,args,true
    end
Add a track to a playlist.