Name recognition

Setting... Sitting behind wife who is sitting at the computer.
Husband: *reading the back of his wife's shirt* [So and so] was in your choir group?
Wife: Yeah. He was also in [some other choir group].
Husband: *continues to read* Oh, and [so and so] was in your group, too?
Wife: Yeah... How did you know that?
Husband: *still reading...* As well as [so and so]?
Wife: What the f**k? How do you know... Oh... F**k you.
Notes