Cyrus auditioned for the Disney Channel television series Hannah Montana when she was eleven years old. She auditioned for the role of the title character's best friend, but was called to audition for the lead role instead. Despite being denied the part at first because she was too "young and small" for the role, she was selected later as the lead because of her singing and acting abilities.  The series premiered in March 2006 to the largest audience for a Disney Channel program, and quickly ranked among the highest-rated series on basic cable.  The success of the series led to Cyrus being labeled a "teen idol".  She toured with The Cheetah Girls as Hannah Montana in September 2006, performing songs from the show's first season. Walt Disney Records released a soundtrack credited to Cyrus' character in October of that year.  The record was a commercial success, topping the Billboard 200 chart in the United States; it went on to sell over three million copies worldwide.  With the release of the soundtrack, Cyrus became the first act within The Walt Disney Company to have deals in television, film, consumer products, and music.