There are a few ground rules:
(1) The song has to be played in its entirety, and it's gotta be the same song by the same artist - that is, the same recording - so live versions don't count.
(2) You must call when you hear the song - i.e. not three weeks later.
(3) It has to be a standard workday, not a public holiday! This includes regional anniversary days.
(4) At all times commercial filler audio, paid advertising and advertising material are not valid audio for this promotion.
(5) Standard Rock Terms & Conditions apply.