Favorite Musical Group

Alright, listen up, you big dummy. This is a classic wordplay setup. The first part asks about a favorite musical group. The punchline, "The Who?", is a famous rock band. But it also sounds exactly like someone asking "Who?" because they've forgotten who the group is, which is a symptom of Alzheimer's disease. See? It's a play on words, combining the band's name with a common question asked by someone with memory loss. You probably still didn't get it, did you?