Anticipating a bloody Clint Eastwood-Lee Marvin shoot-'em-up, Bart and Homer are horrified to discover that their video rental, Paint Your Wagon, is actually a musical. Several song and dance moments from seasons past are recalled.
In between the songs, the family singing causes to come in; he is bothered by the Simpsons' singing and constantly tries to kill them, ironically doing his own singing. During the credits, Snake's voice can be heard trying to prevent the theme music from playing in the background, having grown annoyed of music over the course of the episode. Later, he came back and pointed his gun at The Simpsons but had no bullets so he left again to get ammo. Near the end, he was finally going to kill them, but they said their singing had ended and he had no reason to kill them so he left again. But when Marge was pulling down the banner, she was humming the main theme, so Snake fired a bullet, breaking the glass to which Marge remarked that she was done singing (or humming).
During the end credits, Snake is heard shooting, which causes the theme song to stop, then play very quietly. Snake still hears it, and shoots again. When the Gracie Films logo is seen, he even shoots the music there.