I noticed that your FM sign turned off at the beginning of the song, and turned back on at the end.
I think I know why you did it (so it doesn't distract from the show), but realistically, most visitors will be out for a drive and will happen to stumble upon your light display. If they drive up during the song, they won't know to tune in. I have my FM sign right at the curb, and I have "proof" (don't want to explain here) that people don't see it and just drive by a house with weird flashing lights not knowing there's music to to along with it.