Until last week, one of the year's best songs was little more than a verse, chorus and a perfect wail.

Yet that's all that hungry early fans of "A Star Is Born" needed to fixate over "Shallow," the song featured in the film's obsessed-over first trailer. It's "Shallow" that elevates the clip from normal blockbuster fare to a masterwork of the form, with Lady Gaga's throaty howl giving way to its "I'm off the deep end / Watch as I dive in" chorus as the trailer cuts between punches, naked bodies, tears and guitars. 

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