Playbill.com takes a look back at Aiken's career with clips from the second season of "American Idol," his performances of Broadway classics, television appearances and more.

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"Mack the Knife"

Clay Aiken and Heather Headley sing “Can You Feel The Love Tonight?”

"Listen," featuring Clay Aiken and Quiana Parler

Clay Aiken and Kelly Clarkson sing “Open Arms”

Aiken's initial audition for "American Idol":

"Don't Let the Sun Go Down on Me" on "American Idol":

"Bridge Over Troubled Water" on "American Idol":

"Unchained Melody" on "American Idol":

"Grease" on "American Idol":

Aiken performing at the Home for the Holidays benefit at the Beacon Theatre:

Aiken talks about starring in Broadway's Spamalot on "The View":

Aiken's performance of "Home" from The Wiz at the 2011 Broadway Backwards:

Aiken's performance of "This is the Moment" from Jekyll & Hyde at the Bringing Broadway Home benefit:

Aiken singing "Those Magic Changes" from Grease:

Aiken, Terrence Mann, Lauren Kennedy, Sharon Lawrence and Quiana Parler performing "Imagine":

Aiken singing "In Whatever Time We Have" from Children of Eden alongside Lauren Kennedy:

"Last Night of the World" from Miss Saigon, featuring Aiken and Quiana Parler: