The boys of the NYPD choir were singing "Galway Bay"
And the bells were ringing out for Christmas day
Not necessarily exactly this, but something similar: some sort of iconic festive public performances of traditional songs, ideally by some sort of NYC institution?
Searches on "NYPD choir" just find references to the song, and sadly according to Wikipedia, when the video for the song was made, there was no NYPD choir (the closest they could find was the NYPD Pipes and Drums, who didn't know Galway Bay, and were singing a song about Mickey Mouse...)
...but maybe things have changed, or, maybe there's some similar NYC institution who do similar public performances of similar classic old songs that could evoke a similar atmosphere?