Peter: Alright, so Psalms 137: Basically, it's about the Israelites being sad and homesick while they were in exile.

Brian: So it's like that episode of The Simpsons when they all go to Shelbyville?

Peter: You got it, Brian. Except it's much sadder because they don't want to ever go back home.

Lois: That's really heartbreaking.

Stewie: Yeah, and then they talk about how they would be happy if they could just forget their troubles and just dance and sing.

Chris: Like when we went to the Spice Girls concert?

Peter: Yeah, that's kind of the idea. Then they talk about how they would never forget Jerusalem and the things that happened there.

Brian: So it's like when I go back to my hometown and remember all the good times?

Lois: Something like that, yes.

Stewie: And then they talk about how they would be willing to do anything to make sure Jerusalem remains a powerful city, even if it means taking revenge on the people who destroyed it.

Chris: Like when I got revenge on that kid who stole my Game Boy?

Peter: Yeah, kind of like that.