Itd_britney_spears_-_circus_(pre-order_bonus_tr...

: A marker used by early digital distributors or rippers to denote the source of the file.

: Available only to users who pre-ordered the album through the iTunes Store . iTD_Britney_Spears_-_Circus_(Pre-order_Bonus_Tr...

Footage of Britney recording can be seen in the Making of the Circus documentary, which was included on the DVD paired with physical Deluxe Edition copies. : A marker used by early digital distributors

: It often accompanies "Pre-order" tracks to distinguish them from the standard album tracks that were available for individual purchase after the release date. Connection to "The Making of Circus" iTD_Britney_Spears_-_Circus_(Pre-order_Bonus_Tr...