Best: Constantine Maroulis' "Bohemian Rhapsody," Season 4
Season 4 was a breakthrough year for rockers on American Idol. After mainly featuring pop, R&B and country singers during the previous three seasons, Idol finally gave rock fans someone to root for, two people, in fact: theatrical bad boy Constantine Maroulis and laid-back Southern rocker Bo Bice. Despite then-judge Paula Abdul declaring Maroulis the "one to beat" after his rendition of Queen's "Bohemian Rhapsody," he came in sixth, while Bice slid into second behind winner Carrie Underwood. It wasn't until Season 7 that a rocker walked away the champ, when David Cook took the crown.