Question: WHo is a Grammy winning American musician of Armenian descent, Armen Nalbandian or Arto Tunçboyacıyan?

Context paragraphs:
Türkçe Sözlü Hafif Anadolu Müziği: Türkçe Sözlü Hafif Anadolu Müziği is an album by Arto Tunçboyacıyan released in 2004.

Eleftheria Arvanitaki: Eleftheria Arvanitaki (Greek: Ελευθερία Αρβανιτάκη) (born October 17, 1957 in Piraeus) is a Greek folk singer.  She originates from the island of Icaria.  Arvanitaki has worked with important musicians, such as Cesária Évora, Arto Tunçboyacıyan, Ara Dinkjian.  On 14 March 2010, Alpha TV ranked her the sixth top-certified female artist in the nation's phonographic era (since 1960).

Love Is Not in Your Mind: Love is Not In Your Mind is an album by Arto Tunçboyacıyan and Vahagn Hayrapetyan released in 2005.

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.

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").

Serart: Serart is a collaboration album by two international Armenian musicians: Serj Tankian ("Ser-"), lead singer of System of a Down, and folk multi-instrumentalist Arto Tunçboyacıyan ("-art").  It was the first release on Tankian's own label, Serjical Strike Records.

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.

Onno Tunç: Ohannes Tunçboyacıyan (a.k.a. Onno Tunç; Armenian: Օհաննես Թունչբոյաջյան ; December 20, 1948 - January 14, 1996) was a leading Armenian-Turkish musician, working mainly as a composer and an arranger.  Tunç also played bass guitar and occasionally double bass, contributing to the albums of several musicians.  He was the elder brother of musician Arto Tunçboyacıyan.

Every Day Is a New Life: Every Day is a New Life is an album by Arto Tunçboyacıyan released in 2000 under the Living Music label.

Artostan: Artostan is an album by Arto Tunçboyacıyan, recorded in 2004 and released in 2005.

Supporting paragraphs: Armen Nalbandian Arto Tunçboyacıyan
Answer: Arto Tunçboyacıyan