Tormentor is a black metal band formed in 1986 in Budapest, Hungary.
 They recorded their first album, "Anno Domini", in 1988, but were unable to release it until the end of communism.
 The album reached Norway through the tape-trading community.
 Following the suicide of Per Ohlin, Mayhem invited Attila Csihar from Tormentor to join the band; he was to perform the vocals on "De Mysteriis Dom Sathanas".
 Tormentor split up in 1991.
 After a long break they reformed and released the more experimental "Recipe Ferrum" through Avantgarde Music in 2001.
Lee Dong-hae (hangul: 이동해; hanja: 李東海; born October 15, 1986) is a South Korean singer, songwriter and actor.
 He is a member of the boy band Super Junior, its subgroup Super Junior-M, and Super Junior-D&E, as well as the dance-centered group SM The Performance.
 He is one of the first four Korean artists to appear on Chinese postage stamps.
Fire Walk with Us!
 is the second studio album by the industrial black metal band Aborym.
 This is Aborym's first album to feature Mayhem vocalist Attila Csihar as a full-time member.
 "Fire Walk with Us!"
 contains a cover of Burzum's Norwegian: "“Det som en gang var”" , in which bassist Malfeitor Fabban performs vocals.
Attila Csihar (] ; born 29 March 1971), also sometimes known as Void, is a Hungarian black metal vocalist, best known for his vocal work on Mayhem's "De Mysteriis Dom Sathanas" album.
 Author Ian Christe describes his vocals as "operatic."
Hungarian metal is the metal music scene of Hungary.
 One of the most popular and well-known band is Attila Csihar's Tormentor.
 Other bands include Sear Bliss, Ektomorf, FreshFabrik, Blind Myself, The Idoru and .
Gravetemple is the name given to the line-up of Attila Csihar, Stephen O'Malley and Oren Ambarchi.
 The trio formed in the summer of 2006 to perform a series of live shows in Israel, while Israel was engaged in the 2006 Lebanon War.
 In Summer 2008 the trio reformed together with Australian drummer Matt "Skitz" Sanders for a short European tour.
 This band is not to be confused with the Burial Chamber Trio which consists of a similar line-up but with Greg Anderson instead of Stephen O'Malley.
 Gravetemple released "The Holy Down" in 2007 through Southern Lord Records.
Monoliths & Dimensions is the sixth studio album by the avant-garde drone doom band Sunn O))).
 The album was created and recorded over a period of two years and features the collaborations of composer Eyvind Kang, Australian guitar player Oren Ambarchi, Hungarian vocalist Attila Csihar, Dylan Carlson from the drone band Earth, and trombonists Julian Priester and Stuart Dempster.
 Also present is an upright bass trio; French and English horns; harp and flute duo; piano, brass, reed, and string ensembles; and a Viennese woman's choir led by composer and vocalist Jessika Kenney.
Sinsaenum is an international heavy metal band.
 Formed in 2016, the band is a supergroup which features vocalists Sean Zatorsky and Attila Csihar, guitarists Frédéric Leclercq and Stéphane Buriez, bassist Heimoth, and drummer Joey Jordison.
 Sinsaenum released its debut album "Echoes of the Tortured" in July 2016.
Burial Chamber Trio is a drone doom band consisting of American guitarist/bassist Greg Anderson, Hungarian vocalist Attila Csihar and Australian multi-instrumentalist Oren Ambarchi.
 These three musicians are also performing with Sunn O))).
Generator is the fourth studio album by the Italian industrial black metal band Aborym.
 Former vocalist Attila Csihar makes a guest appearance on this album, performing vocals on "Man Bites God".
 Vocals on the rest of the album are performed by Prime Evil.

Question: Attila Csihar and Lee Donghae, share which musical occupation?
Answer: singer