The studio albums in the American Idol compilation series''' are compilations of songs by American Idol contestants normally released every year towards the end of the season or after the season has ended. For the first five seasons, the albums consist of cover songs from all the finalists of the season, and is released as CDs before the last episode by RCA Records. After season 5, such compilations were released only sporadically. Compilations for individual contestants were released digitally starting season 6. No compilations were released in season 7. Starting season 10, compilation albums are released for sales on iTunes straight after the contestants' performances during the season. Sales figures are not released during the season for these album so all numbers are for sales after the season is over. Albums Season 1 After Idols debut season, the top four finalists (Kelly Clarkson, Justin Guarini, Nikki McKibbin, Tamyra Gray) each recorded a version of the song in the event that they won; but only the winner (Clarkson) released it as a single. The single was included in Clarkson's debut album Thankful. Season 2 In addition to the compilation album by season 2 contestants, a Christmas album American Idol: The Great Holiday Classics was released later in the year featuring recordings of Christmas songs by contestants from both season 1 and season 2. Both compilation albums were certified gold. After season two, the winner (Ruben Studdard) and runner-up (Clay Aiken) each released simultaneously a single containing two songs of one original and one cover. The originals are "This is the Night" (Aiken) and "Flying Without Wings" (Studdard); and the covers are "Bridge Over Troubled Water" (Aiken) and "Superstar" (Studdard) Season 3 After season three, the winner (Fantasia Barrino) and runner-up (Diana DeGarmo) each released a single containing three songs of which one was a rendition of "I Believe." Barrino's debut album, Free Yourself, included "I Believe" and "Summertime." DeGarmo's debut album, Blue Skies, included "Dreams" and "Don't Cry Out Loud." Season 4 After season four, the winner (Carrie Underwood) and runner-up (Bo Bice) each released a single for "Inside Your Heaven" and which included one cover song from the show, "Independence Day" (Underwood, also on Showstoppers) and "Vehicle" (Bice). Underwood's debut album Some Hearts also included "Inside Your Heaven" and achieved 7 times Platinum certification. Season 5 After season 5, winner Taylor Hicks and runner-up Katharine McPhee each released a single