This song is written by Richard File and Wendy Rae Fowler, and performed by their band, We Fell To Earth. With the song and the visuals, especially the way light is used, this kind of feels like a commercial for a luxury car. Of course, AMC is no stranger to luxury car ads:
(Incidentally, the music in Slattery’s ad is a remix of a song by Massive Attack)
But most car commercials don’t have cutaways to a dead body - in fact, even Twin Peaks’ opening sequence didn’t have cutaways to a dead body (the comparisons have been made). But Twin Peaks and car commercials aside, the shot of Mireille Enos driving around Seattle reminds me mostly of this (and a little bit this).