Question: When was the Austrian band formed that made the album Solo?

full_context: Document 1: Opus Dei (album): Opus Dei is the third studio album by Laibach, released in 1987. It features "Geburt einer Nation" ("birth of a nation"), a German cover of Queen's "One Vision", and two reworkings of the Austrian band Opus' sole hit single "Live Is Life". The Opus song became the German language "Leben heißt Leben" and the English language "Opus Dei". "The Great Seal" is the national anthem of the NSK State, the lyrics taken from Churchill's speech We shall fight on the beaches. A new arrangement of the song appears on Laibach's album "Volk", with the title "NSK". On "Volk", the song is credited to Laibach and Slavko Avsenik, Jr.
Document 2: Opeth: Opeth is a Swedish heavy metal band from Stockholm, formed in 1989. The group has been through several personnel changes, but lead vocalist, guitarist and songwriter Mikael Åkerfeldt has remained Opeth's primary driving force throughout the years. Opeth has consistently incorporated progressive, folk, blues, classical and jazz influences into its usually lengthy compositions, as well as strong influences from death metal, especially in their early works. Many songs include acoustic guitar passages and strong dynamic shifts, as well as both death growls and clean vocals. Opeth is also well known for their incorporation of Mellotrons in their work. Opeth rarely made live appearances supporting their first four albums; but since conducting their first world tour after the 2001 release of "Blackwater Park", they have led several major world tours.
Document 3: List of R5 concert tours: American pop rock band R5 has embarked on five concert tours, two of which have been worldwide, and two promotional tours. In March 2010, they self-released an EP, "Ready Set Rock", and in September released their debut studio album with Hollywood Records. The second EP, "Loud", was released on February 19, 2013, which featured the lead single and title track "Loud", the debut single from upcoming album. The band's first full-length album, "Louder", was released on September 24, 2013 and the album not only includes the four songs from "Loud" and also seven new songs. The second single from the album, "Pass Me By", premiered on Radio Disney on August 16. The music video premiered on 29 August on Disney Channel and is available for public viewing on the band's Vevo channel. The third single, "(I Can't) Forget About You", was released on December 25, 2013 and reached number 47 on "Billboard" Digital Pop Songs, and the fourth single "One Last Dance" on May 29, 2014.
Document 4: Solo (Opus album): Solo is the fifth album by Austrian pop rock band Opus. It was released in 1985. It peaked at #8 on the Ö3 Austria Top 40 Longplay. The first single "Rock on the Rocks", peaked at #21 on the Ö3-Hitparade. The second single, "Idolater", peaked at #24 on the Ö3-Hitparade.
Document 5: Glad (band): GLAD is one of the pioneers of Christian pop/rock and a cappella music, having formed as a progressive rock group in 1972 and discovered a large audience for their a cappella music in 1988. Today, with over 1.5 million albums sold, they continue to perform concerts and release occasional recordings. As Contemporary Christian Music ("CCM Magazine") described it, "GLAD's elegant vocals helped set them apart from other pioneers of Contemporary Christian music. That vocal sound has since evolved into a complex, self-sustaining life form of its own..."
Document 6: Rocker (album): Rocker is the third studio album by Serbian heavy metal band Kraljevski Apartman. For the first time in the band's history, an official keyboard player was brought in substituting the second guitar. The band presented a heavy but at the same time a melodic approach to their music with heavy-riff songs and power ballads. The band recorded eleven new songs plus one bonus track from "Labyrinth" movie soundtrack. The album featured ballad "Dama iz kraljevskog apartmana" which became their stamp for the future, "Ranjena zver" (for which the band recorded a promotional video), glam metal-oriented "Vino, viski i Rock 'n' Roll" and "Za ljubav ne treba da moliš" which became classics and considered unskipable on live appearances. The track "Niemansland" was written in German language and Zdravković provided the vocals. This is the first Kraljevski Apartman track on foreign language and not sung by Lalović.
Document 7: C'est la Vie (Despina Vandi album): C'est La Vie (English: "That's life") is the eighth studio album released by Greek singer Despina Vandi. Initially, the album was distributed exclusively via a bundling with the newspaper "Real News" on 13 June 2010, marks the first LP released on label "The Spicy Effect", as well as her first studio album of new material since 2007's "10 Hronia Mazi". The album contains eleven songs, composed and produced entirely by Phoebus, with Zoi Grypari having written the lyrics on two songs, Vaggelis Konstandinidis on one song, and one song which is a co-production with a member of German band Schiller, Christopher von Deylen. The album was released via magazine stores of sale on 24 June 2010 in a one disc edition featuring five additional remixes and a fan magazine dedicated to Despina Vandi. Also, was released via traditional points of sale on 29 June 2010 in a double disc edition featuring seven additional remixes, including the five remixes from the second edition
Document 8: 4,5,6: 4,5,6 is the solo debut by emcee Kool G Rap, released on September 26, 1995, on Cold Chillin' Records. The release followed his break-up with DJ Polo in 1993. The album was mostly received neutrally among critics, but was warmly accepted by underground fans. Despite the album's dark, grimy street sound, it peaked at number one on the R&B/Hip-Hop chart, and the single "Fast Life" charted on the "Billboard" Hot 100. The album features guest appearances from B1, MF Grimm, and Nas (who also appeared on the front cover), as well as production from Dr. Butcher, Naughty Shorts, T-Ray, and Buckwild of D.I.T.C. It would also be Cold Chillin' Records' final release before it went defunct in 1997.
Document 9: List of Europop artists: Europop refers to a style of pop music that first developed in today's form in Europe, throughout the late 1970s. Europop topped the charts throughout the 1980s and 1990s. Some Europop stars came from France, Germany, Italy, Ireland, Netherlands and the United Kingdom, but most were Swedish in origin. In the 1970s, such groups were primarily popular in continental countries, with the exception of the biggest Europop outfit ever, Swedish 4-piece ABBA, who achieved great success in the UK, where they scored a 19 top 10 singles and 9 chart-topping albums, and in North America and Australia. In the late 1980s and early 1990s, Roxette and Ace of Base led Europop in American and British mainstream audiences. In the 1990s, pop groups like the Spice Girls, Aqua, Backstreet Boys and singer DJ BoBo were strongly influenced by Europop. In the 2000s, one of the most popular representators of Europop music is Swedish pop group Alcazar. One of the main differences between American and European pop is that Europop is generally more dance and trance oriented. In central Europe, Italo disco (a.k.a. ’80s Eurodisco) and Euro house (a.k.a. ’90s Eurodance) (later) are the predominant attempts by young musicians to have a hit record in and beyond the borders of their own country.
Document 10: Opera (Super Junior song): Opera is the third official Japanese single of South Korean boy band Super Junior, released on 9 May 2012 by Avex Trax. It was originally released in Korean as part of their fifth Korean studio album, "Mr. Simple" on 3 August 2011. This single set a new record as the most singles sold by a Korean artist in a week.
Document 11: Opus (Austrian band): Opus is a pop-rock group from Graz, Austria. Formed in 1973, the group remains active today. The band is chiefly known for its 1985 single release, "Live Is Life", which reached the Top 10 in several European countries.
Document 12: Opus musicum: Opus musicum is a publisher established in 1969 in Brno, Czech Republic. It focuses on publishing of a music magazine under the same name but has also its own book series called "Opus Musicum Library". Since its foundation the OM Library has published 20 titles. The music magazine is published every two months and contains studies and essays on music and related cultural themes, articles, reviews, news.
Document 13: So Rock: So Rock is the second solo comedy album released by the Australian musical comedian Tim Minchin. It was recorded during Minchin's shows at The Dolphin Theatre in Perth during June 2006.
Document 14: Sex and the Single Man: Sex and the Single Man is third solo album by guitarist/singer/songwriter Ray Parker Jr. released in 1985 on the Arista label. The record includes the singles "Girls Are More Fun" and "One Sided Love Affair".
Document 15: New Zealand top 50 albums of 2015: This is a list of the top-selling albums in New Zealand for 2015 from the Official New Zealand Music Chart's end-of-year chart, compiled by Recorded Music NZ. The chart includes 12 albums by New Zealand artists, including two albums by popera trio Sole Mio. The chart also includes 12 albums that featured in the New Zealand top 50 albums of 2014.
ground_truth: in 1973