Question: Adrián Barilari is the vocalist of the heavy metal band formed in what year?

full_context: Document 1: Massacre (Argentine band): Massacre is an Argentine Alternative rock band, formed in 1986 in Buenos Aires. It was formed by high school students influenced by American and British bands of the early 80s Alternative Rock movement. Among his influences, artists like TSOL, Dead Kennedys, Black Flag, Nirvana, The Cure, Guns N' Roses, The Ramones, T. Rex, Sumo, Gustavo Cerati, Luis Alberto Spinetta, among others. Taking cues from the Underground rock scene in the United States, they gained notoriety at the time for being an entirely independent group that self-managed its affairs, as well as producing and distributing its own records (attitudes which were still fairly foreign to Latin American rock bands of the era). This helped pave way for the cult status that the band still enjoys within and outside their native Argentina.
Document 2: La Renga (album): La Renga is a 1998 album by the band La Renga. It contains the band's hits "El "Revelde"" and "El Twist del Pibe". The album does not have a name but the fans gave it the name of the band. The band members called it "the album of the star", because it has a big white star on the front cover. It achieved 3× platinum in Argentina for sales in excess of 180,000 copies.
Document 3: Horcas: Horcas is a Heavy metal band from Argentina created in 1988 by Osvaldo Civile, former guitarist for V8, Argentina’s landmark heavy metal outfit in the 1980s. After quitting V8 in 1985, and impressed by the new generation of thrash metal bands from the Bay Area led by Metallica, Civile set out to put together a new group in that line. That seminal project, which included former V8 bandmate Gustavo Rowek on the drums, was however delayed for a number of reasons, and it was not until 1988 that it could definitely take off. By that time though, put off by the incessant postponements, Rowek had joined another former V8 member, Walter Giardino, in his new project Rata Blanca.
Document 4: Andrés Calamaro: Andrés Calamaro (Andrés Calamaro Masel, August 22, 1961), is an Argentine musician, composer and Latin Grammy winner. His former band "Los Rodríguez" was a major success in Spain in the 1990s. He is multi-instrumentalist and he became one of the main icons of the Argentine rock and has sold over 1.3 million copies.
Document 5: Ratt: Ratt is an American heavy metal band that had significant commercial success in the 1980s, with their albums having been certified as gold, platinum, and multi-platinum by the RIAA. The group is perhaps best known for hit singles such as "Round and Round" and "Lay It Down", tracks that ranked on Billboard's top 40 at No. 12 and No. 40, respectively, as well as other songs such as "Wanted Man", "You're in Love" and "Dance". Along with groups such as friendly rivals Mötley Crüe, Ratt has been recognized as instrumental in the formation of the early 1980s Los Angeles glam metal scene, also known as "hair metal" or "pop metal".
Document 6: Miguel Mateos: Miguel Mateos (born January 26, 1954) is an Argentine rock singer-songwriter from Villa Pueyrredón, Argentina. Outside Argentina he is considered one of the most important exponents of Rock en Español, specially in the 1980s when he along with Charly Garcia, Soda Stereo, Enanitos Verdes, Virus, Sumo, Fabulosos Cadillacs, Rata Blanca, and many more bands became international stars in the so-called "Argentine Invasion" (""La Ola Argentina"") of rock music that swept Latin America and parts of North America and Europe. It helped popularize Spanish-language rock outside Argentina, and make the genre a commercially successful industry.
Document 7: Argentine rock: Argentine rock (locally Rock nacional) is rock music composed or made by Argentine bands or artists mainly in the Spanish language. For nearly half a century it has been a major popular genre, and is regarded as part of the music tradition of Argentina alongside tango and Argentine folk music.
Document 8: El Libro Oculto: El Libro Oculto (The Hidden Book) is the fourth album by Argentine metal band Rata Blanca. The album was recorded in 1993 in Spain. The album has a heavier sound than previous albums. After recording this album vocalist Adrián Barilari and keyboardist Hugo Bistolfi left the band. Both Barilari and Bistolfi later founded Alianza.
Document 9: Rata Blanca: Rata Blanca (White Rat in English) is a heavy metal band from Argentina, formed in 1986. It is considered the most famous metal band in its country, and one of the most important of the genre in South America.
Document 10: La Llave de la Puerta Secreta: La Llave de la Puerta Secreta ("The Key of the Secret Door" in English) is the eight studio album by Argentine hard rock band Rata Blanca released by PopArt Music in 2005. Produced by Walter Giardino, the album was a commercial success, particularly in Argentina, where it sold well enough to be certified Platinum by the CAPIF that same year. The album includes the hit single "Aún Estás en Mis Sueños", which became the band's new classic and a perennial radio favorite.
Document 11: Barilari: Barilari is a project band from Argentina fronted by the Rata Blanca vocalist Adrián Barilari. The band formed in 2001 due to Adrian's wishes to form a solo project away from the demands of his other bands. In 2003 he invited his friends from Nightwish and Jens Johansson from Stratovarius to become the makeup of this dream. Barilari has been compared to such bands as Tobias Sammet's Avantasia and Ayreon.
Document 12: Adrián Barilari: Adrián Eduardo Barilari (born November 11, 1959) is an Argentine singer best known as the vocalist of the heavy metal and hard rock band Rata Blanca. He also has his own solo band.
Document 13: Billy Milano: Billy Milano is a Bronx-born heavy metal musician now based in Austin, Texas. He is the singer and - occasionally - guitarist and bassist of crossover thrash band M.O.D., and he was also the singer of its predecessor, Stormtroopers of Death. He was also the singer of United Forces, which also featured his Stormtroopers of Death bandmate Dan Lilker.
Document 14: Dogo Argentino: The Dogo Argentino, also known as the Argentine Mastiff, is a large, white, muscular dog that was developed in Argentina primarily for the purpose of big-game hunting, including wild boar; the breeder, Antonio Nores Martínez, also wanted a dog that would exhibit steadfast bravery and willingly protect its human companion. It was first bred in 1928, from the Cordoba Fighting Dog along with a wide array of other breeds including the Great Dane.
Document 15: La Barranca: La Barranca has been a successful ongoing outfit for over a decade. Based in Mexico City, they are led by guitarist and songwriter José Manuel Aguilera, who previously and concurrently worked with Sangre Azteka, Jaguares, Cecilia Toussaint, Steven Brown/Nine Rain (Tuxedomoon), and more. He has an unusually economical style of playing that concentrates on great rhythms, superb tone, and very melodic solos. After the original lineup—Aguilera, Federico Fong (bass), Alfonso Andre (drums), all of whom were guest members of Jaguares with former Caifanes frontman Saúl Hernández—went its separate ways, a second version of the band included Santa Sabina guitar virtuoso Alex Otaola and the extremely flexible rhythm section of brothers Jose María ("Chema") and Alonso Arreola. The band's sound effortlessly moves from flat out rock to fusion-ish jamming and passes through a kind of Mexican folk influence along the way. Aguilera is a good singer with a talent for finding simple melodies amidst rather complex songs. On "El Fluir" the band decided to record live and to cut back on the keyboard and programmed additions to their music. Surprisingly, the result was not an over-the-top jamfest but rather a very tightly arranged set of songs that hinted at the overwhelming power they could possess in concert. The two guitar interplay between Aguilera and Otaola was highly impressive as they explored all forms of playing together and against one another (with Otaola pulling all sorts of radical sounds out of his guitar). "El Fluir" was their first US release since "Tempestad" in 1998. This edition was further sweetened by the inclusion of a previously unreleased bonus track and a video for the first single "Pare de Sufrir."
ground_truth: 1986