[Ask ] "bring down the room"?

[chen95982000 (元元)]

I'm just reading some recap and comments about the TV series "Glee"
(Hope somebody here would like it as I do...)

and a phrase in the paragraph confused me a bit,
"Last December the New Directions were pretty much pulse-free as they sang "Do
They Know It’s Christmas?" – a song about homeless, hungry and
disadvantaged people – at a shelter full of homeless, hungry and
disadvantaged people. Talk about bringing down the room."

Judging from the context,
I can get that the "bring down the room" is kind of similar as
"to make something in harmony" or "to make the world better",
I just wanna make sure, is it really what I'm thinking about?
this phrase is kinda rare to me...thanks.

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