Device is usually a constructed tool, but may refer more specifically to:

David Michael Draiman (born March 13, 1973) is an American songwriter and the lead singer for the metal band Disturbed. Draiman is known for his distorted voice and percussive singing style. In November 2006, Draiman was voted number 42 on the Hit Parader’s "Top 100 Metal Vocalists of All Time"..

Draiman announced in July 2011 that the band Disturbed is on "hiatus" until further notice.

He announced in March 2012 on his Twitter page that he is working on an industrial rock/metal project with Geno Lenardo, formerly of Filter. In May 2012 David Draiman stated that the name of his new side project has been named Device

Draiman is quoted as saying, "the first record I ever bought was Kiss’ Destroyer. And those classic bands like Black Sabbath were my first loves...I focused on the seminal metal bands like Metallica, Iron Maiden, Pantera and Queensrÿche."

Draiman continues, "But I could also appreciate the hair metal bands – When you hear Whitesnake, you can’t deny their greatness. Then I went in the direction of punk and new wave, groups like the Sex Pistols, The Ramones, The Misfits and later The Smiths and The Cure – that was my ’80s."

Serj Tankian (Western Armenian: Սերժ Թանգեան [ˈsɛɾʒ tʰɑnˈkʰjɑn]; born August 21, 1967) is a Lebanese-born Armenian-American singer–songwriter, composer, multi-instrumentalist, playwright, record producer, poet, and political activist. He is best known as the lead vocalist, songwriter, keyboardist, and occasional live rhythm guitarist of the rock band System of a Down.

During his musical career, Tankian has released five albums with System of a Down, one with Arto Tunçboyacıyan (Serart), as well as three solo albums Elect the Dead, Imperfect Harmonies and Harakiri. A live orchestral version of Elect the Dead incorporating the Auckland Philharmonia Orchestra named Elect the Dead Symphony was released. In 2002, Tankian and Rage Against the Machine/Audioslave guitarist Tom Morello co-founded a non-profit political activist organization, Axis of Justice. Tankian also founded the music label Serjical Strike Records.

Tankian is ranked 26th in the Hit Parader's Top 100 Metal Vocalists of All Time.

Terence Michael Joseph "Geezer" Butler (born 17 July 1949 in Birmingham, England) is an English musician and songwriter. Butler is best known as the bassist and lyricist of heavy metal band Black Sabbath. He was also involved in Heaven & Hell from 2006 to 2010.

Butler formed his first band, Rare Breed, with old friend John "Ozzy" Osbourne in the autumn of 1967. Separated for a time, Osbourne and Butler reunited in the blues foursome, Polka Tulk, along with guitarist Tony Iommi and drummer Bill Ward. They renamed their band Earth, but after finding a band in the small-time English circuit with the same name, soon adopted Black Sabbath in early 1969.

Butler played rhythm guitar in his pre-Sabbath days, including with Rare Breed, but when Sabbath was formed, Iommi made it clear that he would not want to play with another guitarist, so Butler moved to bass.

Butler is noted as being one of the first bassists to use a Wah-wah pedal on his bass, as showcased at the beginning of "N.I.B." which inspired many later bassists. He was also one of the first bassists to down-tune (from the standard EADG to the lower C#F#BE), in order to match Iommi who had started tuning his guitar to C# (one and a half steps down). While Ozzy Osbourne was the frontman of the band, Butler wrote almost all of the band's lyrics, drawing heavily upon his fascination with religion, science-fiction, fantasy and horror, and musings on the darker side of human nature that posed a constant threat of global annihilation.