Hm, looks like 14 RB2 songs wont export...
The 9 Harmonix bands (which will return as DLC later on for free)
Let There Be Rock
Anyway You Want It
Give It Away
As well as 2 RB1 songs not showing up:
Black Hole Sun
And the DLC from the week with 2 Tenacious D songs don't show up for some reason according to some people on certain Fora...
A whole bunch of favorites
And 2 more:
"Hier Kommt Alex" by Die Toten Hosen (from the European version of Rock Band)
"Rock 'n' Roll Star" by Oasis (from the European version of Rock Band)
Mostly relicensing issues/guitar hero exclusivity i'ld wager...
Except for the DLC songs for September 15th last year, seems to be a missed bug...