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.
The "iTD" prefix in the filename often appears in older metadata or archival rips. It typically signifies: iTD_Britney_Spears_-_Circus_(Pre-order_Bonus_Tr...
: 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. Footage of Britney recording can be seen in