Specifically I'm trying to track down the song playing at the end of *Rescue Me*, Season 4, Episode 6.

A friend was asking me about this. Naturally I assumed with a few Google searches I'd be able to turn it up, but this has been astonishingly difficult.

* Nothing on FX's site seems pertinent.
* Wikipedia turns up nothing.
* The series' official soundtrack was released before Season 4 was released, so no good there
* Turning on subtitles on Netflix *does* reveal the songs lyrics, which is particularly interesting given how muffled they are. I don't know how this data works - obviously in, e.g., in a pirated series, the subtitles may be made by the pirates themselves. But I know nothing of this metadata or whether it might be possible to purchase the episode in a digital form and find other metadata residing with the song.
* The credits on Netflix seem irrelevant. This surprised me because I thought the song would require, you know, being credited. The series is 5-10 years old so may predate modern business models, in which it's clearly *not* to the advantage of the producer to obscure the origin of the song (conversely here I am advertising the series, but I'm guessing this is not the thinking, even if it arguably should be). Some producers involved in sound and music were listed. I could possibly try them on LinkedIn but that sounds like beyond a last resort.
* Shazam was not able to determine it on a few tries.

I feel this information should be somehow researchable / trackable. And obviously it is via social networking but that sounds like a very uphill battle. In particular I'm wondering if it's possible to infer the song from the same metadata that has the subtitles. Are there any other approaches to doing this?