Question: What nationality do Ara Dinkjian and Matt Vasgersian have in common?

full_context: Document 1: Brent Musburger: Brent Woody Musburger ( ; born May 26, 1939) is an American sportscaster, lead broadcaster and managing editor at Vegas Stats and Information Network (VSiN). He retired in January 2017 from the ESPN and ABC television networks. Formerly with CBS Sports and one of the original members of their program "The NFL Today", Musburger has also covered the NBA, MLB, NCAA football and basketball, and NASCAR and served as a studio host for games, a play-by-play man, and halftime host. He has also performed postgame wrap-up segments and covered championship trophy presentations. He is a member of the Montana Broadcaster's Association Hall of Fame.
Document 2: Arto Tunçboyacıyan: Arto Tunçboyacıyan (Armenian: Արտո Թունջբոյաջյան ) (born 4 August 1957 in Istanbul) is a Grammy winning American musician of Armenian descent. An avant-garde folk artist (singer, multi-instrumentalist), he appeared on more than 200 records in Europe before arriving in the United States, where he went to work with numerous jazz legends including Chet Baker, Marc Johnson, Al Di Meola, and Joe Zawinul as well as a semi-regular stint with Paul Winter and the Earth Band. Arto fronts his own group called the Armenian Navy Band. He also worked with Turkish singer Sezen Aksu and the Greek singer Eleftheria Arvanitaki. His brother Onno Tunç was also a musician. He is also a member of the band Night Ark. He has won a Grammy award.
Document 3: 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.
Document 4: Bob Costas: Robert Quinlan Costas (born March 22, 1952) is an American sportscaster, on the air for NBC Sports television since the early 1980s. He was the prime-time host of 12 Olympic Games, from 1992 until 2016. Costas currently does play-by-play for MLB Network and hosts an interview show called "Studio 42 with Bob Costas".
Document 5: Onnik Dinkjian: Onnik Dinkjian (Armenian: Oննիկ Տինքճեան , born 1929) is a French born American-Armenian musician and singer. He is father of Ara Dinkjian, and has appeared with his son as well as other Armenian musicians such as Roupen Altiparmakian playing oud.
Document 6: Ara Dinkjian: Ara Dinkjian (Armenian: Արա Տինքճեան ; born 1958) is an Armenian-American musician. He is the founder of the band Night Ark. Dinkjian is considered one of the top oud players in the world, his compositions have been recorded in thirteen different languages, which include the multi-platinum hit "Dinata", it was performed in the closing ceremonies of the 2004 Olympic Games in Athens.
Document 7: Thursday Night Baseball: Thursday Night Baseball (formally known as MLB Network Showcase) is the title of a presentation of Major League Baseball on cable and satellite channel MLB Network (self-produced by MLB Network), that premiered on April 9, 2009. Longtime NBC Sports broadcaster Bob Costas is one of the play-by-play voices of the broadcasts. Matt Vasgersian also does play-by-play on some games. Jim Kaat, John Smoltz, and Tom Verducci provide color commentary. The network produces 26 non-exclusive live games a year during baseball season. Since one or both teams' local TV rights holders also carry the games, the MLB Network feed is subject to local blackouts. In that event, the cities in the blacked-out markets will instead see a simulcast of another scheduled game via one team's local TV rights holder.
Document 8: Andy Masur: Andy Masur (born 1967) is an American sportscaster, announcing San Diego Padres baseball and University of San Diego men's basketball games over XEPRS-AM (XX 1090) in Tijuana near San Diego.
Document 9: Joe Buck: Joseph Francis "Joe" Buck (born April 25, 1969) is an American sportscaster and the son of sportscaster Jack Buck. He has won numerous Sports Emmy Awards for his work with Fox Sports, including his roles as lead play-by-play announcer for the network's National Football League and Major League Baseball coverage, and is a three-time recipient of the National Sportscaster of the Year award. Since 1996, he has served as the play-by-play announcer for the World Series, each year, with the exceptions of 1997 and 1999.
Document 10: Dinata: Dinata or Dynata is a song from the album "Meno Ektos"; its music was composed by Ara Dinkjian, its lyrics written by Lina Nikolakopoulou and it was first sung by Eleftheria Arvanitaki while Arto Tuncboyaciyan features in non verbal singing and percussion in some versions and performances of it; it mixes the influence of Balkan, Greek and Armenian music with electronics. This song, among the others on "Meno Ektos", made Arvanitaki a big name in Greece; a notable performance of it by her was at the closing ceremony of the 2004 Athens Olympics, during the fireworks and after the flame had been extinguished.
Document 11: List of Major League Baseball on Fox broadcasters: Matt Vasgersian was a regular announcer. Dick Stockton and Josh Lewin were also regular fill in announcers. Leo Mazzone was as a fill in color commentator.
Document 12: Armen Nalbandian: Armen Nalbandian (born April 6, 1978 in Manchester, England) is a jazz pianist, composer, author, and activist from Los Angeles, California, known for his multidisciplinary collaborations in visual and fine art.
Document 13: Armenian opera: Armenian opera is the art of opera in Armenia or opera by Armenian composers. The founder of the Armenian operatic tradition was Dikran Tchouhadjian (1837-98), who was born in Constantinople in the Ottoman Empire and received his musical education in Milan, where he became a great admirer of Verdi. He was a political and musical nationalist who mixed Western and Armenian influences in his work. His "Arshak Erkrord" is regarded as the first Armenian opera. It was written in 1868 but had to wait until 1945 for a full staging. The libretto, by Tovmas Terzian, is based on the life of the 4th-century king Arsaces II (Arshak II). Chukhadjian's other operas include "Arifi khardakhutyune" ("The Government Inspector", based on the play by Gogol, 1872); "Zemire" (1891), which was written in Turkish and premiered in Constantinople; as well as "Kyose Kyokhva" ("The Balding Elder"), "Lelebidj" ("The Pea Seller") and "Indiana".
Document 14: Night Ark: Night Ark is an instrumental jazz quartet formed in 1986. The members are American-Armenian Ara Dinkjian, Turkish Armenian Arto Tunçboyacıyan, American-Armenian Armen Donelian and American Marc Johnson. The quartet's most famous piece is "Homecoming"; a famous version thereof set to lyrics in Greek is "Dynata", first sung by Eleftheria Arvanitaki. Homecoming was also the theme for the successful satirical Israeli television series 'HaHamishiya HaKamerit' ("The Chamber Quintet").
Document 15: Matt Vasgersian: Matthew Edward "Matt" Vasgersian (born September 28, 1967) is an American sportscaster and television host. Vasgersian is currently a play-by-play announcer for Fox Sports' coverage of Major League Baseball, as well as a studio host for the MLB Network. In the past he has served as an announcer for Fox Sports' National Football League coverage, NBC Sports' coverage of the Olympic Games, and NBC Sports' coverage of the short lived XFL. He formerly called play-by-play for the Milwaukee Brewers and the San Diego Padres.
ground_truth: American