The band opened for Spears for eight dates in April and May 2004 , during the European leg of the tour .
Wicked Wisdom landed a slot on Britney Spears ' Onyx Hotel Tour in 2004 , one of the year 's highest - profile tours .
The band opened for Britney Spears for eight dates in April and May 2004 , during the European leg of the tour .
Wicked Wisdom landed a slot on Britney Spears ' Onyx Hotel Tour in 2004 , one of the year 's highest - profile tours .