As soon as Countdown is shown on Fallon I think there will be an increase on itunes because everyone will want to see her perform while shes pregnant.. Not knowing it was pre recorded..
The "Glee-effect" hinders the success of other songs?
Totally. Every week at least 6 new glee songs are released on iTunes and they climb very fast. After 2 days they'll drop faster than Beyonce's fall when she performed Ring The Alarm. Taylor Swifts songs will be dropping soon too.