Question: Are both Ontronik Khachaturian and Siouxsie Sioux singers and producers?

Context paragraphs:
Ontronik Khachaturian: Ontronik "Andy" Khachaturian (Armenian: Անդրանիկ Խաչատուրեան ; born May 4, 1975) is an Armenian–American, musician, producer and DJ.  He is known for being the original co-founder/drummer (1993–1997) of the Grammy Award-winning metal band System of a Down and founder/lead vocalist (1999–2002) of the alt-progressive rock band The Apex Theory.

Feast (The Creatures album): Feast is the debut album by British duo the Creatures (comprised by Siouxsie Sioux and musician Budgie, then-members of the band Siouxsie and the Banshees).  It reached No. 17 in the UK Albums Chart and the "Miss the Girl" single peaked at No. 21.  With their first album, the band embraced exotica, including "waves crashing on beaches", "found-sound effects from nature" and local Hawaiian chanters.  Critic Ned Raggett described it as "a lush, tropical experience".

Topsy-Turvy (album): Topsy-Turvy is the debut album by the progressive metal band The Apex Theory, now Mt. Helium.  Released on April 2, 2002, it was the band's last release as a quartet, with the vocalist Ontronik Khachaturian leaving the band shortly after the album's release.  After attempting to audition for a new vocalist, it was decided that the guitarist Art Karamian would take over as the band's vocalist.

Siouxsie and the Banshees personnel: Siouxsie and the Banshees went through several lineup changes throughout their history.  Vocalist Siouxsie Sioux and bassist Steven Severin were the only original members that remained from beginning to end.  Kenny Morris was the drummer of the group's first major incarnation; Budgie replaced him in late 1979.  The Banshees had several guitarists, including John McKay, John McGeoch, Robert Smith, John Valentine Carruthers, Jon Klein and Knox Chandler.  From mid-1987, Siouxsie and the Banshees became a quintet with the addition of multi-instrumentalist Martin McCarrick.

Siouxsie and the Banshees: Siouxsie and the Banshees were an English rock band, formed in London in 1976 by vocalist Siouxsie Sioux and bass guitarist Steven Severin.  Initially associated with the English punk rock scene, the band rapidly evolved to create "a form of post-punk discord full of daring rhythmic and sonic experimentation".  In 1978, they released their critically acclaimed debut album, "The Scream", and built their reputation over the next few years through subsequent releases.  With "Juju" in 1981, the group also became an important influence on the emerging gothic rock scene.  They disbanded in 1996, with Siouxsie and drummer Budgie continuing to record music as the Creatures, a second band they had formed in the early 1980s.  In 2004, Siouxsie began a solo career.

Robert Brian: Robert Brian (born 1 July 1970, Corsham, Wiltshire, England) is an English professional jazz and rock drummer and session musician, most notably for Siouxsie Sioux of Siouxsie and the Banshees.

The Creatures: The Creatures were a band formed in 1981 by Siouxsie and the Banshees members Siouxsie Sioux and Budgie.  With the dissolution of Siouxsie and the Banshees in 1996, the Creatures graduated from an occasional project to a full-time concern.  The drum and voice duo released four studio albums: "Feast" in 1983, "Boomerang" in 1989, "Anima Animus" in 1999 and "Hái! " in 2003.

Siouxsie Sioux: Susan Janet Ballion, better known by her stage name Siouxsie Sioux (/ˈsuːziː suː/ , born 27 May 1957), is an English singer, songwriter, musician and producer.  She is best known as the lead singer of the alternative rock band Siouxsie and the Banshees (1976–1996) and the drums-and-voice duo the Creatures (1981–2005).  Siouxsie and the Banshees released 11 studio albums and several UK Top 20 singles including "Hong Kong Garden", "Happy House", "Peek-a-Boo", plus a US Billboard Top 25 hit "Kiss Them for Me".  With the Creatures, Siouxsie recorded four studio albums and the hit single "Right Now".  She has also sung with artists such as Morrissey and John Cale.  After disbanding the Creatures in the mid-2000s, she has continued as a solo artist and released "Mantaray" in 2007.

Hái!: Hái!  is the fourth and final album to be released by British duo the Creatures, composed of former Siouxsie and the Banshees members Siouxsie Sioux and Budgie.  The album was recorded in two parts: the drums were recorded by Budgie and Kodo drummer Leonard Eto in Tokyo in August 2002 and the rest of the recording was done in Europe.  During their stay in Japan, the band was inspired and "touched by the delicate snowfall imagery of Akira Kurosawa's "Ikiru" (1952), absorbing the vibrancy of Tokyo's Roppongi district, and spiritualised by the ancient Shinto shrines and tranquil shores of Lake Ashi."

Hyæna: Hyæna is the sixth studio album by English rock band Siouxsie and the Banshees, released in 1984.  The opening track, "Dazzle", featured strings played by a 27-piece orchestra called the "Chandos Players"; it was scored from a tune that Siouxsie Sioux composed on piano.  "Hyæna" is the only studio album that guitarist Robert Smith of The Cure composed and recorded with Siouxsie and the Banshees.

Supporting paragraphs: Ontronik Khachaturian Siouxsie Sioux
Answer: yes