___ of Broadway (1935 song, 1951 film) (7)

I believe the answer is:

lullaby

(Other definitions for lullaby that I've seen before include "soothe" , "Go-to-sleep song" , "Soporific song" , "Soothing bedtime song" , "Soothing song for child" .)

I've seen this clue in The Guardian.

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