'American Idol' Season 21: 5 things you need to know about ABC's singing competition show

'American Idol' Season 21: 5 things you need to know about ABC's singing competition show
'American Idol' judges Lionel Richie, Katy Perry, and Luke Bryan (ABC)

It was literally the end of an era when FOX canceled 'American Idol' after season 15, and a resurrection felt like the only logical next step. As expected, ABC's revival consistently stayed afloat in ratings, and season 20 has been a big hit too. This season, fans had gone on a worldwide quest in Nashville, Tennessee; Austin, Texas; and Los Angeles, California, where the show's legendary judge auditions surprised viewers and hopefuls alike with never-seen-before twists and a first-ever Platinum ticket winner.

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Huntergirl, Leah Marlene, and Noah Thompson are the last three contenders. Luke Bryan, Katy Perry, and Lionel Richie will perform on stage as part of the season finale tradition. It's one of our favorite moments of the season finales every year. As the season comes to a close, here's everything you need to know about Season 21 of 'American Idol.'