: While a pre-order exclusive in North America, "Trouble" also appeared as a bonus track on the French Amazon MP3 edition of the album. File Naming Convention ("iTD")
Watch clips from the recording sessions of the Circus album, which included the production of rare bonus tracks like 'Trouble': iTD_Britney_Spears_-_Circus_(Pre-order_Bonus_Tr...
: Available only to users who pre-ordered the album through the iTunes Store . : While a pre-order exclusive in North America,
: Because it was tied to the digital pre-order window, it is not found on standard physical CD versions or modern streaming editions of the album. iTD_Britney_Spears_-_Circus_(Pre-order_Bonus_Tr...