Taylor Swift, Sam Smith, Iggy Azalea, Meghan Trainor and Sia are all up for Record of the Year at the 2015 Grammy Awards. With stiff competition like that, there's no doubt that this will be a tough one. Whose song has your vote?

Taylor Swift's 'Shake It Off' debuted at Numero Uno on the Billboard Hot 100 -- not a small feat! 'Shake It Off' was Taylor's first single from '1989,' and the first song that gave us insight into the sound of '1989.' It's upbeat, peppy, endlessly catchy and everything we could ever want in a pop song.

Sam Smith stormed the world with 'Stay With Me,' an emotional ballad that showcased his gorgeously distinct vocals. While the British crooner had crazy success across the pond, he also broke America with the single, which reached No. 2 on the Billboard Hot 100. Without a doubt, 'Stay With Me' was one of our favorite songs of the year and cemented a place for Sam Smith in our hearts (and iTunes) forever.

Iggy Azalea's 'Fancy' -- featuring Charli XCX -- also scored the No. 1 position on the Billboard Hot 100. The addictive song, with its insanely catchy hook and Iggy's fast-paced rhymes, had every girl ever singing along about just how fancy she is.

While Meghan Trainor was 'All About That Bass,' the world was all about Meghan Trainor, loving her hit song about body positivity. (It spent eight weeks at No. 1!) 'All About That Bass' rocks a retro vibe that we're obsessed with, and, of course, features Meghan's gorgeous voice on the track. And how can you go wrong with that?

Sia had long been known for her songwriting (and for singing on other artist's hooks) when she released 'Chandelier,' giving the world a glimpse at the Aussie songstress in her own right. And we loved it, eating up her smoky, strong vocals like they were dinner. There's no doubt that Sia brought. it. with 'Chandelier,' distinguishing herself as a crazy successful artist all on her own.

Which song do you want to see take home the Grammy for Record of the Year? Cast your vote in the poll below! You can vote once per hour until the poll closes at 7 PM ET on Sunday, Feb. 8.

Plus, be sure to check out music from this year's contenders on our Beats Music account! Listen to our 57th Grammys Nominees playlist here.

See Taylor Swift + More Celebs' Yearbook Photos