I think the race on June 26th will be tight. Bieber will still have power in selling from his week before; Linking Park are huge first week sellers and BID is way better opener than the Catalyst; Chris Brown may be slightly underperforming but he has a faithful stanbase and I believe that Maroon 5 this time around will provide first week numbers more in the line of IWBSBL than HAO, so they will have a nice performance too.
My prediction is LP > Bieber > M5 = CB.
It's gonna be a good week for sales. Which is good
