It may be absolutely nothing, but rewatching Two Cities for the 3rd time, I realized that when they show Jack in the car keeping tabs on Sarah, the radio is playing a song by Glenn Miller which I recognize but don't know the name of offhand.

I do, however, know that the last time I heard that song was when Sayid and Hurley tuned in that garbled radio signal on the Island last season. They commented that they didn't know where it came from, and Hurley added cryptically "Or when..." or something to that effect. At the time it made me think time warp, but I don't think that is the case in this instance.

Jack saw his dad's ghost on the Island, heard his dad's voice over the speaker in the Hydra station, and a song that meant something to a specific time and place in his life was broadcasting on a radio carrier on an Island in the middle of nowhere.

Or maybe Lost just can't afford a lot of music licenses...

Wikipedia had that being said last week, on the description of "A Tale of Two Cities" Synopsis.

So you are correct on that!

Nice catch. So what was the name of the song?

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"Moonlight Serenade" was the song, I believe. I'll have to rewatch LOST to hear it on Jack's radio,

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Ther are a couple of occasions when the same song is playing twice in the same season. I think it's cool

Now that you mention it, I was thinking along those lines when he said that. But I was thinking "return transmission" like in the movie Contact.

It just seems to be way TOO coincidental to hear the same NEVER-PLAYED song this many times for it not to be the same song played only once but heard at different points in time. But not necessarily because of time warp.