Question: What was the nationality of the musician who made a guest appearance on 3 tracks in Skeletons & Majesties Live? 

full_context: Document 1: Kiske/Somerville: Kiske/Somerville is a melodic heavy metal duet project, put together in late 2009 by Frontiers Records. The project features vocalist Michael Kiske (ex-Helloween, Unisonic, Place Vendome) collaborating with American singer Amanda Somerville (Aina, HDK, Trillium, Epica).
Document 2: Andi Deris: Andreas "Andi" Deris (born 18 August 1964) is a German singer and songwriter, best known as the lead vocalist of power metal band Helloween, and co-founder and former lead singer of German melodic metal band Pink Cream 69. He has an active solo career, as well as his own recording studio in Tenerife.
Document 3: City of Heroes (album): City of Heroes is the second studio album by the melodic rock / heavy metal duet project Kiske/Somerville. The album features the collaboration between vocalist Michael Kiske (ex-Helloween, Unisonic, Place Vendome) and American singer Amanda Somerville (Aina, HDK, Trillium). It was released on 17 April 2015 in Europe and on 21 April 2015 in North America.
Document 4: Spin It Again! Live in Munich: Spin It Again! Live in Munich is a live album and video by the Canadian band Saga. It was recorded in 2012 at the end of their 20/20 tour and celebrates the reunion with original singer Michael Sadler. It was also the first Saga release featuring their new drummer Mike Thorne. Besides three songs from "20/20", it includes mainly songs from the first five Saga albums. The concert was released on different formats by edel records/earMUSIC, including a double CD, DVD (Super Jewel Box packaging) and Blu-Ray. The video formats also include a twenty-minute tour documentary. The CD has edited applause between the main set and the encores, but otherwise the performance is identical. As is typical for Saga shows in Germany, Michael Sadler does some German announcements. The concert also includes a litte "unplugged" set. After returning to the stage, Sadler says "What shall I play?". He starts on "Images (Chapter 1)", then stops, goes into "No Regrets (Chapter 5)", stops again and finally declares "I got it!" before launching into "Tired World (Chapter 6)".
Document 5: Past in Different Ways: Past in Different Ways is the fourth solo album of vocalist Michael Kiske. It features acoustic renditions of songs written by Kiske during his time in Helloween and one new track. This came as a surprise to fans, considering Kiske's desire to leave the world of Helloween and heavy metal behind him.
Document 6: Winger Live: Winger Live is a two CD and DVD live set culled from Winger 2007 US reunion tour and directed by Jack Edward Sawyers. Kip Winger, Reb Beach, Rod Morgenstein and John Roth rip through all the hits, progressive jams and new material taken from their comeback album IV. Keyboardist Cenk Eroglu was not present for this show, despite his appearance on IV. The concert was recorded live straight through with no interruptions at the Galaxy Concert Theater in Santa Ana, California. The cover consists of a checkerboard-style grid of live still frames pulled from the video footage itself.
Document 7: Klaus Meine: Klaus Meine (born 25 May 1948) is a German vocalist, best known as the lead singer of the hard rock band Scorpions. He and guitarist Rudolf Schenker are the only two members of the group to appear on every Scorpions album. Meine was placed at #22 on Hit Parader's Top Heavy Metal Vocalists of All Time list in 2006.
Document 8: To the Metal!: To The Metal! is the tenth full-length studio album by Gamma Ray. It was released on 29 January 2010. To promote the album, the band did a tour with Freedom Call and Secret Sphere. The album was recorded in Kai's own studio in Hamburg in autumn 2009. The band has recorded 12 songs. Ten of them were featured on the regular album release, while the other two were bonus tracks appearing on the different editions of the album. The band described some of the songs on the official website, revealing that there would be a full-throttle number called "Rise", a rhythmic and melodically diverse song called "Time To Live", and a multilayered anthem titled "All you need to know", featuring ex-Helloween frontman Michael Kiske. Other songs mentioned are "No Need to Cry", a song written by Dirk Schlächter about the death of his father, "To The Metal", a song they played on various festivals before the album release and the atmospheric and dense "Empathy". It is the last album featuring drummer Dan Zimmermann.
Document 9: Skeletons &amp; Majesties Live: Skeletons & Majesties Live is the fourth live album of the metal band Gamma Ray. The album was recorded during Gamma Ray's 2011 concert in Pratteln (Switzerland) and contains acoustic renditions of the songs "Rebellion in Dreamland" and "Send Me a Sign" as well as the guest appearance of ex-Helloween and current Unisonic vocalist Michael Kiske on 3 tracks.
Document 10: Kiske/Somerville (album): Kiske/Somerville is the debut album of the melodic rock / heavy metal duet project Kiske/Somerville. The album features the collaboration of vocalist Michael Kiske (ex-Helloween, Unisonic, Place Vendome) with American singer Amanda Somerville (Aina, HDK, Trillium). The album was released on 24 September 2010 with cover art credited to Stanis W. Decker.
Document 11: Helloween: Helloween is a German power metal band founded in 1984 in Hamburg, Northern Germany by members of bands Iron Fist and Gentry. Its first line-up consisted of singer and guitarist Kai Hansen, bass guitarist Markus Grosskopf, guitarist Michael Weikath, and drummer Ingo Schwichtenberg. After the release of a self-titled EP and their debut album "Walls of Jericho" in 1985, it expanded into a quintet with the addition of singer Michael Kiske, Hansen choosing to focus on guitar instead. Under this line-up, they released the "Keeper of the Seven Keys" albums (1987 and 1988), which established Helloween as a notable heavy metal band and led to the creation of the power metal subgenre. However, Hansen left the band quickly after the release of "Part II" and was replaced by Roland Grapow. He then created the band Gamma Ray.
Document 12: Live from Vatnagarðar: Live from Vatnagarðar is the first live album by the Icelandic alternative folk band Of Monsters and Men, released digitally through Republic Records worldwide on 20 September 2013. The album consists of six tracks from their previous album re-recorded live in studio, plus a cover of Yeah Yeah Yeahs' "Skeletons". Four of the re-recorded tracks are performed as they are at the group's current concerts, with the exception of "King and Lionheart" and "Little Talks", which are entirely new renditions. One of the new renditions, "Little Talks", was played on the band's May/June North American Tour (12 May 2013). "Skeletons" is a song frequently played at their concerts, making it relevant to this "live" album.
Document 13: Michael Kiske: Michael Kiske (born January 24, 1968) is a German singer best known as the lead vocalist for the German power metal band Helloween. After his departure from the band, Kiske recorded four solo albums, participated on various metal and rock related projects, such as Avantasia, Place Vendome and Kiske/Somerville, while he also performed with numerous bands as a guest vocalist. In late 2009, he formed the hard rock / heavy metal band Unisonic and began touring again after 17 years of absence. On November 14, 2016 it was officially announced that Kiske will tour again with Helloween and Kai Hansen in 2017 and 2018.
Document 14: Kai Hansen: Kai Michael Hansen (born 17 January 1963) is a heavy metal guitarist and vocalist.
Document 15: Unisonic (band): Unisonic is a German hard rock/power metal supergroup, founded in November 10, 2009 by former Helloween singer Michael Kiske alongside Dennis Ward and Kosta Zafiriou from Pink Cream 69 and Mandy Meyer, formerly in Asia and Gotthard. In 2011 the band was joined by Gamma Ray leader and Helloween co-founder, Kai Hansen.
ground_truth: German