An AppleScript to pull the current song and artist from the Rdio application.

rdio.osa

#!/usr/bin/osascript

tell application "Rdio"
    set playerStatus to (get player state)
    return (playerStatus) as text
end tell
tell application "Rdio"
    if player state is playing then
        set trackName to (get name of current track)
        set artistName to (get artist of current track)
        return ("Now Playing On Rdio: " & artistName & " - " & trackName) as text
    end if
end tell