Which Finnish hip hop group that was active between 1998 and 2005 sang  "Freestyler" 
Freestyler (song): "Freestyler" is a single by Finnish hip hop group Bomfunk MC's. Bomfunk MC's: The Bomfunk MC's were a Finnish hip hop group that was active between 1998 and 2005.
The Bomfunk MC's