Question: Şahan Arzruni was an ethnic Armenian classical pianist whereas Shavo Odadjian was known for what?
Context: System of a Down is an American rock band formed by musicians of Armenian origin: vocalist Serj Tankian, guitarist Daron Malakian, bassist Shavo Odadjian, and drummer John Dolmayan in the mid-1990s.  They have released five studio albums, 16 singles, and 11 music videos. By the end of 1997, the group had signed to American Recordings, then distributed as Columbia Records.  The following year, they released their eponymous debut album, which peaked at #124 on the United States' "Billboard" 200 and #103 on the United Kingdom's UK Albums Chart; it was certified platinum two years later by the Recording Industry Association of America (RIAA), and gold by Canadian Recording Industry Association (CRIA).  Their eponymous debut album produced a single for the song "Sugar", which reached the top 30 on the "Billboard" mainstream rock songs and alternative songs charts.  Their follow-up album, "Toxicity" (2001), topped the US and Canadian charts, and also reached the top 10 in Australia, Finland, and New Zealand.  The album was certified triple platinum in its home country, and triple platinum in Australia by the Australian Recording Industry Association (ARIA), as well as double platinum by CRIA in Canada.  "Toxicity" produced singles for the title track, "Chop Suey! ", and "Aerials".  The last of these peaked at number one on the "Billboard" Mainstream Rock Songs and Alternative Songs charts. Kinetic 9 or Beretta 9 (born Samuel Craig Murray) is a member of the hip-hop group Killarmy, a group affiliated with The Wu-Tang Clan.  .  He is also a member of the group Achozen alongside Shavo Odadjian and The RZA. Welcome is the second major label album by the rock music group Taproot.  It was released on October 15, 2002. " Poem" served as the album's lead single and became a smash hit, propelling the group to stardom.  A follow-up single, "Mine," was produced and its video was directed by System of a Down bassist Shavo Odadjian.  The third single and video was announced for "Art," but curiously Atlantic pulled the plug soon after the announcement, further irking fans who claimed the label was holding Taproot back.  "Welcome" remains Taproot's most successful record, selling around 450,000 copies. "Mine" is the second and final single from Taproot's second studio album "Welcome".  Along with "Poem", the song is one of the band's most successful singles.  A music video was released for the song and was directed by System of a Down bassist Shavo Odadjian. The Movses Khorenatsi medal (Armenian: Մովսես Խորենացու մեդալ ) is the Republic of Armenia's highest cultural award.  It is presented by the president to people who have significantly contributed to the advancement of Armenian culture. Artist Richard Jeranian received the medal in 2011 and pianist Şahan Arzruni in 2015. Shavarsh "Shavo" Odadjian (Armenian: Շավարշ "Շավո" Օդաջյան ; born April 22, 1974) is an Armenian American songwriter, multi-instrumentalist, music video director/editor, music producer, and artist/painter.  He is best known as the bassist, backing vocalist and occasional songwriter of the Grammy Award-winning metal band System of a Down.  During the band's hiatus from 2006 to 2010, Odadjian collaborated with Wu-Tang Clan founder RZA on a project called AcHoZeN, which contributed a number of songs to the motion picture "Babylon A.D." A compilation album was released in 2015.  Odadjian is also credited with the musical scoring of the film, alongside The Rza and Hans Zimmer.  He originally used Gibson Thunderbird basses, a Fender Jazz Bass, an Ibanez BTB bass guitar, and a Music Man StingRay, but has since moved on to Warwick basses. Achozen [pronounced: UH-choh-zen] (occasionally typeset as AcHoZeN) is a project by System of a Down bassist Shavo Odadjian, Wu-Tang Clan member RZA, Killarmy member Kinetic 9, and Wu-Tang Clan affiliates Reverend William Burke.  The group's debut album has been completed and set for release for several years now, and it is unknown when or if the album will be released, considering Odadjian's commitments to System of a Down, who reunited in 2011.  In July 2015, the group released a boombox digital collection of 8 songs recorded over the last few years.  A standard album is still in the making, though songs are already available.  After both Wu-Tang and System of a Down organized their respective reunions, material was released. George Clinton and His Gangsters of Love is a cover album by funk music pioneer George Clinton.  The album includes guest appearances from the Red Hot Chili Peppers, Sly Stone, El DeBarge, System of a Down bassist Shavo Odadjian, Carlos Santana, RZA, Kim Manning and gospel singer Kim Burrell.  The disc was released on September 16, 2008. Şahan Arzruni (Armenian: Շահան Արծրունի ; born 8 June 1943) is an ethnic Armenian classical pianist, composer, ethnomusicologist, lecturer, writer and producer, residing in New York City. System of a Down, sometimes shortened to System and abbreviated as SOAD, is an Armenian-American heavy metal band from Glendale, California, formed in 1994.  The band currently consists of Serj Tankian (lead vocals, keyboards), Daron Malakian (vocals, guitar), Shavo Odadjian (bass, backing vocals) and John Dolmayan (drums).
Answer: bassist, backing vocalist and occasional songwriter