Question: Which musician performed with the group Elastica, Chuck Schuldiner or Justine Frischmann?

full_context: Document 1: Shannon Hamm: Shannon Hamm is a death metal guitarist who played in Death from 1996 until their break-up in 2001. He then joined Chuck Schuldiner's second band Control Denied, which ended with the death of Schuldiner in 2001. Before Death, he was a locally well known guitarist in the Texas underground metal scene. He was particularly good friends with "Dimebag" Darrell Abbott of Pantera and Damageplan. According to Abbott, Hamm "out shredded" Darrell in Pantera's glam metal days while Hamm was in a band named Metalstorm.
Document 2: Death (metal band): Death was an American death metal band from Orlando, Florida, founded in 1983 by guitarist and vocalist Chuck Schuldiner. Death is considered to be one of the most influential bands in heavy metal and a pioneering force in death metal. Its debut album, "Scream Bloody Gore", has been widely regarded as the first death metal record, while the band's driving force, Chuck Schuldiner, is acknowledged as the originator of extreme metal. Death had a revolving lineup, with Schuldiner being the sole consistent member. The group's style also progressed, from the raw sound on its early albums to a more sophisticated one in its later stage. The band ceased to exist after Schuldiner died of glioma and pneumonia in December 2001, but remains an enduring metal band.
Document 3: Thomas Gabriel Fischer: Thomas Gabriel Fischer (born 19 July 1963), also known by his stage names of Tom G. Warrior and Satanic Slaughter, is a Swiss metal musician. He is considered to be one of the pioneers of the death metal style of singing, which resembles guttural growling. He led the groups Hellhammer and Celtic Frost, and today is the frontman of the band Triptykon.
Document 4: Mike Davis (guitarist): Mike Davis (born ca. 1970) is an American metal guitarist. He is best known for his work in the progressive death metal band Nocturnus. He joined the band around 1988, and eventually became the bands' standout lead guitarist. He joined the band when he was just 18 years old and is widely regarded as an underrated guitarist. After the second breakup of Nocturnus in 2003 he formed the band Tiwanaku with Emo Mowery and Richard Christy, but quit early on 
Document 5: Justine Frischmann: Justine Elinor Frischmann (born 16 September 1969) is an English artist and former musician, best known for being the lead singer of the Britpop band Elastica. She is now pursuing a career as a painter.
Document 6: Stutter (Elastica song): "Stutter" is a song by the Britpop group Elastica and was written by lead singer Justine Frischmann. It was originally released as a single in 1993 and then included on the band's 1995 self-titled debut album. The single, which received positive reviews from critics, charted in the US and Canada.
Document 7: Pleasure (Norwegian band): Pleasure is a Norwegian funky pop band, led by Fred Ball. One single was released in 2003, "Don't Look The Other Way", which featured Justine Frischmann (former lead singer for Elastica) on vocals.
Document 8: Elastica: Elastica were an English alternative rock band that played punk rock, post-punk and new wave-influenced music. They formed in 1992, and are best known for their 1995 album "Elastica", which produced singles that charted in the United Kingdom and the United States. They split amicably in 2001 roughly a year after releasing their second LP.
Document 9: Sophie Ellis-Bextor: Sophie Michelle Ellis-Bextor (born 10 April 1979) is an English singer, songwriter and model. She first came to prominence in the late 1990s, as the lead singer of the indie rock band Theaudience. After the group disbanded, Ellis-Bextor went solo, achieving widespread success in the early 2000s. Her music is a mixture of mainstream pop, disco, nu-disco, and 1980s electronic influences.
Document 10: Chuck Schuldiner: Charles Michael Schuldiner (May 13, 1967 – December 13, 2001) was an American singer, songwriter, and guitarist. He founded the pioneering band Death in 1983. Schuldiner is often referred to as "The Godfather of Death metal",
Document 11: Chuck Billy (vocalist): Charles "Chuck" Billy (born June 23, 1962) is an American vocalist, who is best known as the lead vocalist for the thrash metal band Testament.
Document 12: Morbid Angel: Morbid Angel is an American death metal band based in Tampa, Florida formed in 1983 by guitarist and sole remaining original member Trey Azagthoth, original vocalist and bassist Dallas Ward, and original drummer Mike Browning. Widely considered as one of the most influential bands in the genre and important in the transition of death metal from its thrash metal roots, they were one of the first bands to incorporate guttural vocals, up-tempo blast beats, atonality in guitar playing, multiple tempo changes and dark atmosphere. They have been described as one of "the most influential and emulated bands in death metal", alongside Cannibal Corpse, and have been cited as an influence by many later bands. They were also the first death metal band to experience mainstream success in connection with being signed to Giant Records in 1992, heavy rotation of their music videos on MTV, and having the music video for the song "God of Emptiness" shown on an episode of "Beavis and Butt-head". Their first four albums are considered classics in the genre.
Document 13: Poly Styrene: Marianne Joan Elliott-Said (3 July 1957 – 25 April 2011), known by the stage name Poly Styrene, was a British musician, singer-songwriter, and frontwoman for the punk rock band X-Ray Spex.
Document 14: Euronymous: Øystein Aarseth (] ; 22 March 1968 – 10 August 1993), who went by the pseudonym Euronymous, was a Norwegian guitarist. Euronymous was a founder of and central figure in the early Norwegian black metal scene. He was a co-founder of the Norwegian black metal band Mayhem. He was also founder and owner of the extreme metal record label Deathlike Silence Productions and record shop Helvete.
Document 15: Elastica 6 Track EP: When released in 1999, Elastica's 6 Track EP was the first new material issued by the band since their self-titled debut four years earlier. According to bandleader Justine Frischmann the EP represented more of a document of what the band was up to during the interim rather than a return to form: "The material has been chosen to allow people to hear rarities and demos which reflect all stages of the bands recording between 1996 and 1999. The EP is certainly not intended to be some big comeback record." Indeed, several of the songs would later find themselves on their second album "The Menace" (2000) although in more polished form.
ground_truth: Justine Elinor Frischmann