Past American Idol Contestants Came Together For Jaw-Dropping Performance on the Finale

American Idol has been on for so long that it's hard to fathom how many budding artists have competed on the show over the years. The series finale aired on Thursday night, crowning a winner and bringing back past favorites like Carrie Underwood. The show opened with a very special performance from a stage full of familiar faces like Scotty McCreery and Ruben Studdard. The gigantic group (seriously, I can't even count how many past Idol contestants are up there) sang Barry Manilow's "One Voice," a fitting track for the show's final episode. Watch and weep.