what is the musical style of this band?
Heavy metal, alternative metal, nu metal, and arena rock
Five Finger Death Punch
Five Finger Death Punch's musical style has generally been regarded as heavy metal, , , alternative metal, nu metal, and arena rock. 
when did five finger death punch become a band 2005
wiki:2682123
Five Finger Death Punch [SEP] Musical style and influences
Five Finger Death Punch's musical style has generally been regarded as heavy metal, , , alternative metal, nu metal, and arena rock. Thom Jurek of AllMusic wrote that Five Finger Death Punch's "instantly recognizable sound is equal parts melodic and meaty guitar riffs, fat vamps, catchy hooks, tight, flashy solos, and hard-grooving bass and drums". Five Finger Death Punch vocalist Ivan Moody's vocals are usually singing and screaming. The band has also released successful ballads, as well. Bathory described Five Finger Death Punch as "a straight-up heavy metal band with a hint of thrash metal—maybe a hint of the Euro stuff in there" and then said, "that's pretty much what we are".