On episode 8 of the last season of AMC's Halt and Catch Fire, Joe takes Haley back to the Goodwill Foundation to try to get back Gordon's green sweater Haley said she wanted to keep. She's listening to music on her walkman, and Joe tells her she can just put it on in the car, instead of listening to it on her headphones. The scene happens at around minute 25 or so of the episode.
The song is only heard briefly, and it features some really high-pitched voices.
What song was that?