Beyoncé's first big AOTY loss! Sam Smith's career night! #WhoIsBeck?! Kanye doing stuff! It's the 2015 Grammys, a pivotal awards night with nearly all the biggest pop stars of the mid-2010s in attendance. On this episode of Greatest Pop Stars, we debut our Great Moments in Pop Star History series, with host Andrew Unterberger joined by Pop Shop Podcast co-host Katie Atkinson to recall the unforgettable night, which set a lot of the narratives into motion that hang over the Grammys to this day -- and may very well resurface at the awards again this Sunday.

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