Some context: 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".
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.
Did the hogwarts have a professor?
A: Hogwarts professor (and re-doubled agent) Severus Snape

Some context: Lifehouse is an American rock band from Los Angeles comprising Jason Wade (lead vocals, guitar), Rick Woolstenhulme, Jr. (drums, percussion), and Bryce Soderberg (bass, vocals). The band came to mainstream prominence in 2001 with the hit single "Hanging by a Moment" from their debut studio album, No Name Face. The song was number one for three weeks on the Billboard Modern Rock Tracks chart and peaked at number 2 on the Billboard Hot 100 charts, and the single won a Billboard Music Award for Hot 100 Single of the Year, having spent twenty weeks in the top 10 and more than a year on the charts. In 2002, Lifehouse released their follow-up album Stanley Climbfall.
In 2000, Blyss re-recorded, remixed, and released twelve of the fifteen Diff's Lucky Day session demos as No Name Face, their debut major label release under the name of Lifehouse. On their choosing the band name, frontman Jason Wade said, "It's about what we do as a band and for me personally. Most of this record is about my life and about life's circumstances. Not only my life, but other peoples' lives. We thought Lifehouse was a good name for it."  No Name Face met significant commercial success and established the band, and eventually would sell in excess of 4 million copies worldwide. This was in part due to the success of "Hanging by a Moment", Lifehouse's first commercial single. Due to the charisma and talent of frontman Wade, DreamWork Record's focus was primarily on him. "Hanging by a Moment" was the third song in chart history to be named the "No. 1 Song of the Year" on the Billboard Hot 100 despite not having reached No. 1 on any weekly Billboard Hot 100 survey (after Sam the Sham & The Pharaohs' "Wooly Bully" in 1965 and Faith Hill's "Breathe" in 2000). The second single from the album, "Sick Cycle Carousel", was not as commercially successful as "Hanging by a Moment", peaking at No. 35 on the Billboard Modern Rock chart; the third and final single was "Breathing", a reworking of a song featured on Diff's Lucky Day.  The song "Everything" was the first of many Lifehouse songs to be featured in the future hit WB drama Smallville. Seven of the band's songs would be featured in episodes of the series' first four seasons, and the band itself would perform live at the Smallville prom at the end of the fourth-season episode "Spirit". The song "You and Me" would be released on the series' second soundtrack, Smallville: The Metropolis Mix, in an extended form, subtitled "Wedding Version" ("You and Me (Wedding Version)"). The song "Everything" was also used in the series' 200th episode, "Homecoming", in the show's 10th and final season, as an homage to the series pilot and first-season finale episodes.  The song "Somewhere in Between", also from No Name Face, was featured in the first-season episode of Falcon Beach, "The Blame Game".  By the time Lifehouse's first album was released, Palmer had left the band, and Wade and Andrade were the only remaining founding members. Soon after recording No Name Face, Wade and Andrade met Rick Woolstenhulme, who auditioned for the needed drummer part and joined the band as full-time drummer. Before the audition, Woolstenhulme had been rehearsing in an adjacent room to Lifehouse and frequently he and Wade would pass each other without meeting the other.
Did No Name Face have any successful singles?
A:
No Name Face met significant commercial success and established the band, and eventually would sell in excess of 4 million copies worldwide.