Canadian electro-industrial music genre pioneers, Skinny Puppy, recently found out their music was used to torture detainees at Guantanamo Bay, so they've decided to send a bill.

A former Gitmo guard, who is writing a book on his experiences, says that inmates were exposed to bootleg recordings of the band's music, at incredibly high volumes, for up to 12 hours at a time. Often until the detainees soiled themselves.

"He witnessed our music being used to torture in an isolation room where people were handcuffed and squatted down for hours on end in a cold room," Skinny Puppy singer Kevin (Ogre) Ogilvie says.

Founding member cEvin Key says the band is sending the U.S. Department of Defense an invoice for $666,000 for its use of their music. Members are also considering a lawsuit against the department.

Hear the song illisiT, by Skinny Puppy, on YouTube, below.