Background: Lord Voldemort (; in the films; born Tom Marvolo Riddle) is a fictional character and the main antagonist in J. K. Rowling's series of Harry Potter novels. Voldemort first appeared in Harry Potter and the Philosopher's Stone, which was released in 1997. Voldemort appears either in person or in flashbacks in each book and its film adaptation in the series, except the third, Harry Potter and the Prisoner of Azkaban, where he is only mentioned. Voldemort is the archenemy of Harry Potter, who according to a prophecy has "the power to vanquish the Dark Lord".
Context: Voldemort does not appear in Harry Potter and the Half-Blood Prince, although his presence and actions are felt: he once again declares war, and begins to rise to power once more. He murders Amelia Bones of the Department of Magical Law Enforcement, and begins to target members of the Order of the Phoenix, including Emmeline Vance. Rowling uses several chapters as exposition to establish Voldemort's backstory. In a series of flashbacks, using the pensieve as a plot device, she reveals that Voldemort was the son of the witch Merope Gaunt and a Muggle called Tom Riddle. Riddle abandoned Merope before their child's birth, soon after which Merope died, just hours after giving birth. After living in an orphanage, young Riddle met Dumbledore, who told him he was a wizard and arranged for him to attend Hogwarts. Riddle was outwardly a model student, but was in reality a psychopath who takes sadistic pleasure in using his powers to harm and control people. He eventually murdered his father and grandparents as revenge for abandoning him. The book also discusses Riddle's hatred of "Muggles", his obsession with Horcruxes, and his desire to split his soul to achieve immortality. Rowling stated Voldemort's conception under the influence of a love potion symbolises the prejudicial circumstances under which he was brought into the world. In the main plot of the book, Voldemort's next step is to engineer an assault on Hogwarts, and to attack Dumbledore. This is accomplished by Draco Malfoy, who arranges transportation of Death Eaters into Hogwarts by a pair of Vanishing Cabinets, which bypass the extensive protective enchantments placed around the school. The cabinets allow Voldemort's Death Eaters to enter Hogwarts, where battle commences and Dumbledore is cornered. Hogwarts professor (and re-doubled agent) Severus Snape uses the Killing Curse against Dumbledore when Draco could not force himself to do so.
Question: Does Voldemort appear in Harry Potter and the Half-Blood Prince?
Answer: Voldemort does not appear in Harry Potter and the Half-Blood Prince,

Problem: Background: Titas (Portuguese pronunciation: [tSi'tas]) are a rock band from Sao Paulo, Brazil. Though they basically play pop/alternative rock, their music has touched a number of other styles throughout their 30-year career, such as new wave, punk rock, grunge, MPB and electronic music. They are one of the most successful rock bands in Brazil, having sold more than 6,3 million albums as of 2005 and having been covered by several well-known Brazilian artists and a couple of international singers. They were awarded a Latin Grammy in 2009 and have won the Imprensa Trophy for Best Band a record four times.
Context: On July 11, 2016, vocalist, guitarist and founding member Paulo Miklos announced he would leave the band to focus on his personal projects. He was then replaced by session member Beto Lee, son of Brazilian notorious rock singer Rita Lee. His first recording with the band is a version of "Pro Dia Nascer Feliz", originally by Barao Vermelho, for the soundtrack of the 24th season of Malhacao, a Rede Globo series. With Lee's inclusion, the band recovered some old songs for its live setlists, including Titanomaquia's "Sera Que E Disso Que Eu Necessito?" and " Nem Sempre se Pode Ser Deus". They also started to have Bellotto sing in some songs. Also in 2016, the band announced a new album for a possible 2017 release. According to Bellotto, it will be a rock opera, and the band intended to enter the studio until mid-2017 so the album could be released in the year's second half. Drawing inspiration from albums such as The Who's Quadrophenia and Green Day's American Idiot, the over 30-track rock opera will have its story written by Hugo Possolo and Marcelo Rubens Paiva. By April 2017, Mello said a handful of tracks were ready. Also in April, the band started a tour called "Uma Noite no Teatro" (A Night at the Theater) with a show that was also the inaugurating event of Shopping Villa-Lobos' theater Opus. The tour included three new songs: "Me Estuprem" (Rape Me), about sexual harassment and rape; "12 Flores Amarelas" (12 Yellow Flowers); and "A Festa" (The Party). By that time, none of them were expected to be featured in the band's next album. On 23 September, however, the band performed them again during their show at the Rock in Rio 7, and this time they were announced as part of the new project. On December 2017, they announced that they had already started recording the album and that it would be released via Universal Music. In January 31, they announced that the opera rock would be released in early 2018 and that its title would be 12 Flores Amarelas.
Question: What was the rock opera?
Answer:
a new album for a possible 2017 release. According to Bellotto, it will be a rock opera,