Relive the glory days of 'American Idol' with its 15 greatest performances

American Idol Ending After 15 Seasons
American Idol Ending After 15 Seasons

After 15 seasons, "American Idol" is officially closing its curtains!

The longtime Fox network powerhouse, which many claim has gone far past its glory days, was once a reality TV staple and in its prime, the show pulled in massive television ratings, boasting nearly 37 million viewers during its peak. Final numbers dwindled down to a dismal 10 million overall in the last season.

Numbers aside, the show has stamped an everlasting impression on television history and was a game-changer for how the music business found talent. After all, "American Idol" is responsible for churning out some of the music industry's biggest names from Kelly Clarkson to Carrie Underwood and Jennifer Hudson to Adam Lambert.​

In celebration of the show's extensive and memorable run, we've put together a list of the best performances of all time on the hit show.

Carrie Underwood performs 'Alone' by Heart

Kelly Clarkson performs 'Stuff Like That There' by Bette Midler

Adam Lambert performs 'Mad World' by Tears For Fears

Katharine McPhee performs 'Over The Rainbow' from "The Wizard of Oz"

Kris Allen performs 'Heartless' by Kanye West

Jessica Sanchez performs 'I Will Always Love You' by Whitney Houston

David Cook performs 'Billie Jean' by Michael Jackson

David Archuleta performs 'Imagine' by John Lennon

Jordin Sparks performs 'I Who Have Nothing' by Ben E. King

Bo Bice performs 'In A Dream' by Badlands

Haley Reinhart performs 'The House Of The Rising Sun' by The Animals

Clay Aiken performs 'Bridge Over Troubled Water' by Simon & Garfunkel

Fantasia Barrino performs 'Summertime' originally from "Porgy and Bess"

Allison Iraheta performs 'Cry Baby' by Janis Joplin

Kelly Clarkson performs 'Natural Woman' by Aretha Franklin

Which performance was your favorite? Tell us in the comments below.

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