Given the question: Information:  - Jeff Young (born March 31, 1962) is an American guitarist. He graduated from Musicians Institute in 1985, and is best known for his time with the thrash metal band Megadeth, appearing on the 1988 album "So Far, So Good... So What!". In addition to his subsequent music projects, he served as an author in "Guitar for the Practicing Musician".  - Lee Altus, born 13 May 1966 in Odessa, Ukrainian SSR, is an American heavy metal guitarist. Altus first came to public attention in the mid-1980s with his original band, Heathen, where Altus displayed his virtuosic and highly technical neoclassical guitar playing style. He is principal songwriter and founding member of Heathen as well, playing on all three of their LP's, "Breaking The Silence", "Victims of Deception" and "The Evolution of Chaos". In 1990, Altus was considered for the position in Megadeth vacated by Jeff Young, but declined due to Megadeth's potentially dangerous drug-heavy life style, and the job was given instead to Marty Friedman.  - The Anvil Chorus is the English name for the ' (Italian for "Gypsy chorus"), a chorus from act 2, scene 1 of Giuseppe Verdi's 1853 opera "Il trovatore". It depicts Spanish Gypsies striking their anvils at dawn  hence its English name  and singing the praises of hard work, good wine, and Gypsy women. The piece is also commonly known by its opening words, "'".  - Doug Piercy is an American heavy metal guitarist . He played in the cult classic San Francisco heavy metal band Anvil Chorus in the early 80 's . Playing in Control briefly , he eventually moved on to his best known project , Heathen in 1985 . Piercy was shared lead and rhythm duties with Lee Altus in Heathen from 1985 to 1992 , playing on both of their LP 's Breaking the Silence and Victims of Deception . He left the band in 1991 after Roadrunner dropped Heathen prior to the Sepultura / European tour . In 1994 , Piercy then formed a new band in Germany , The Company , and released 2 records with them ; the first titled simply `` The Company '' on Teichiku records who reached position 17 in the Japanese HM charts . The second album , titled `` Frozen by Heat '' was released in Europe on Hi Gain records in Germany . In 2006 he moved back to San Francisco . He has participated in various reunions with Heathen and Anvil Chorus , recording guitars on the Anvil Chorus Killing Sun record . In 2010 he put together the Quintannica cover band . He was also collaborating with Jon Torres at the time of his death .  - The premiere took place at the Teatro Apollo in Rome on 19 January 1853, where it "began a victorious march throughout the operatic world," a success due to Verdi's work over the previous three years. It began with his January 1850 approach to Cammarano with the idea of "Il trovatore". There followed, slowly and with interruptions, the preparation of the libretto, first by Cammarano until his death in mid-1852 and then with the young librettist Leone Emanuele Bardare, which gave the composer the opportunity to propose significant revisions, which were accomplished under his direction. These revisions are seen largely in the expansion of the role of Leonora.  - Digipak is a patented style of optical disc packaging, and is a registered trademark of AGI-Shorewood, an Atlas Holdings LLC company. Digipaks typically consist of a gatefold (book-style) paperboard or card stock outer binding, with one or more plastic trays capable of holding a CD or DVD attached to the inside.  - Victims of Deception is the second album by the US thrash metal band Heathen, which was released in 1991 by Roadrunner Records. It was re-issued by Metal Mind Productions in 2006, as a digipak in a limited amount of 2000 numbered copies.  - The City of New York, often called New York City or simply New York, is the most populous city in the United States. With an estimated 2015 population of 8,550,405 distributed over a land area of just , New York City is also the most densely populated major city in the United States. Located at the southern tip of the state of New York, the city is the center of the New York metropolitan area, one of the most populous urban agglomerations in the world. A global power city, New York City exerts a significant impact upon commerce, finance, media, art, fashion, research, technology, education, and entertainment, its fast pace defining the term "New York minute". Home to the headquarters of the United Nations, New York is an important center for international diplomacy and has been described as the cultural and financial capital of the world.  - The San Francisco Peninsula is a peninsula in the San Francisco Bay Area that separates San Francisco Bay from the Pacific Ocean. On its northern tip is the City and County of San Francisco. Its southern base is in northern Santa Clara County, including the cities of Palo Alto, Mountain View and Los Altos. Most of the Peninsula is occupied by San Mateo County, between San Francisco and Santa Clara counties, and including the cities and towns of Atherton, Belmont, Brisbane, Burlingame, Colma, Daly City, East Palo Alto, El Granada, Foster City, Hillsborough, Half Moon Bay, La Honda, Menlo Park, Millbrae, Pacifica, Portola Valley, Redwood City, San Bruno, San Carlos, San Mateo, South San Francisco, and Woodside.  - The United Nations (UN) is an intergovernmental organization to promote international co-operation. A replacement for the ineffective League of Nations, the organization was established on 24 October 1945 after World War II in order to prevent another such conflict. At its founding, the UN had 51 member states; there are now 193. The headquarters of the United Nations is in Manhattan, New York City, and experiences extraterritoriality. Further main offices are situated in Geneva, Nairobi, and Vienna. The organization is financed by assessed and voluntary contributions from its member states. Its objectives include maintaining international peace and security, promoting human rights, fostering social and economic development, protecting the environment, and providing humanitarian aid in cases of famine, natural disaster, and armed conflict.  - San Diego (Spanish for "Saint Didacus") is a major city in California, United States. It is in San Diego County, on the coast of the Pacific Ocean in Southern California, approximately south of Los Angeles and immediately adjacent to the border with Mexico.  - Giuseppe Fortunino Francesco Verdi (9 or 10 October 1813  27 January 1901) was an Italian opera composer.  - Los Angeles (Spanish for "The Angels"), officially the City of Los Angeles and often known by its initials L.A., is the second-most populous city in the United States (after New York City), the most populous city in California and the county seat of Los Angeles County. Situated in Southern California, Los Angeles is known for its mediterranean climate, ethnic diversity, sprawling metropolis, and as a major center of the American entertainment industry. Los Angeles lies in a large coastal basin surrounded on three sides by mountains reaching up to and over .  - San Francisco (SF) (Spanish for Saint Francis) officially the City and County of San Francisco, is the cultural, commercial, and financial center of Northern California. It is the birthplace of the United Nations. Located at the north end of the San Francisco Peninsula, San Francisco is about in area, making it the smallest countyand the only consolidated city-countywithin the state of California. With a density of about 18,451 people per square mile (7,124 people per km), San Francisco is the most densely settled large city (population greater than 200,000) in California and the second-most densely populated major city in the United States after New York City. San Francisco is the fourth-most populous city in California, after Los Angeles, San Diego, and San Jose, and the 13th-most populous city in the United Stateswith a census-estimated 2015 population of 864,816. The city and its surrounding areas are known as the San Francisco Bay Area, and are a part of the larger OMB-designated San Jose-San Francisco-Oakland combined statistical area, the fifth most populous in the nation with an estimated population of 8.7 million.  - Opera (English plural: "operas"; Italian plural: "opere" ) is an art form in which singers and musicians perform a dramatic work combining text (libretto) and musical score, usually in a theatrical setting. In traditional opera, singers do two types of singing: recitative, a speech-inflected style and arias, a more melodic style. Opera incorporates many of the elements of spoken theatre, such as acting, scenery, and costumes and sometimes includes dance. The performance is typically given in an opera house, accompanied by an orchestra or smaller musical ensemble, which since the early 19th century has been led by a conductor.  - An anvil is a block with a hard surface on which another object is struck. The block is as massive as it is practical, because the higher the inertia of the anvil, the more efficiently it causes the energy of the striking tool to be transferred to the work piece. On a quality anvil the smith's hammer should rebound with almost as much energy as the smith puts into the downward stroke, ultimately making the smith's job easier and less physically strenuous. In most cases the anvil is used as a forging tool. Before the advent of modern welding technology, it was a primary tool of metal workers.  - The San Francisco Bay Area (referred to locally as the Bay Area) is a populous region surrounding the San Francisco and San Pablo estuaries in Northern California. The region encompasses the major cities and metropolitan areas of San Jose, San Francisco, and Oakland, along with smaller urban and rural areas. The Bay Area's nine counties are Alameda, Contra Costa, Marin, Napa, San Francisco, San Mateo, Santa Clara, Solano, and Sonoma. Home to approximately 7.65 million people, the nine-county Bay Area contains many cities, towns, airports, and associated regional, state, and national parks, connected by a network of roads, highways, railroads, bridges, tunnels and commuter rail. The combined statistical area of the region is the second-largest in California (after the Greater Los Angeles area), the fifth-largest in the United States, and the 43rd-largest urban area in the world.  - Megadeth is an American heavy thrash metal band from Los Angeles, California. Guitarist Dave Mustaine and bassist David Ellefson formed the band in 1983 shortly after Mustaine's dismissal from Metallica. A pioneer of the American thrash metal scene, the band is credited as one of the genre's "big four" with Anthrax, Metallica and Slayer, responsible for thrash metal's development and popularization. Megadeth plays in a technical style, featuring fast rhythm sections and complex arrangements. Themes of death, war, politics and religion are prominent in the group's lyrics.    After reading the paragraphs above, we are interested in knowing the entity with which 'doug piercy' exhibits the relationship of 'occupation'. Find the answer from the choices below.  Choices: - author  - band  - bassist  - book  - commercial  - conductor  - diversity  - fashion  - forging  - guitarist  - librettist  - major  - member  - mountain  - musician  - opera  - pioneer  - saint  - slayer
The answer is:
musician