Sorry guys,
Guitar Hero World Tour just won the DLC war forever.
The European Track Pack - Available March 19th 2009
1.)
"What Have You Done" by Within Temptation 
2.) "Hier Kommt Alex" by Die Toten Hosen
3.) "Carolina" by M-Clan
And then...
The Queen Track Pack - Available March 26th 2009
1.) "We Are The Champions"
2.) "Fat Bottomed Girls"
3.) "C-lebrity"