Ummmm. Em is not decreasing that much haha!!! The other songs are just now gaining, too. The Glee song will decrease, but I think that Em will have a healthy lead for the rest of the week. Remember, he released it Monday and it rocketed up to the point it is now. I think it has a shot at number one if it keeps this up (which he will!!!!)
I hope pop radio supports it cause it has the potential to do really well.