http://vgchartz.com/weekly.php?date=39768&console=&maker=Electronic+Arts&boxartz=2
Rock Band sales (combined across all platforms): 47,083
Rock Band 2 sales (combined across all platforms): 44,104
Now obviously, Rock Band has the advantage of selling on two extra platforms (the Wii and PS2, whereas Rock Band 2 is yet to release on those two consoles). Still, this is a testament to the legs of the first Rock Band, and as it seems, the competition Rock Band 2 is facing (Guitar Hero World Tour, along with many other games). Rock Band 2 is even selling more slowly than the last version worldwide (at least on the 360).
I'm not sure what the reason, but Rock Band 2 is not doing well on either of the HD consoles. Hopefully the Wii can lend a hand towards increasing the total sales.
