Question: Obi-Wan "Ben" Kenobi is a fictional character in the Star Wars franchise. Within the original trilogy he is portrayed by Alec Guinness, while in the prequel trilogy a younger version of the character is portrayed by Ewan McGregor. In the original trilogy, he is a mentor to Luke Skywalker, to whom he introduces the ways of the Jedi. In the prequel trilogy, he is a master and friend to Anakin Skywalker.

Obi-Wan Kenobi is introduced in the original Star Wars living as the hermit Ben Kenobi on the planet Tatooine. When Luke Skywalker and the droid C-3PO wander off in search of the lost droid R2-D2, Obi-Wan rescues them from a band of native Tusken Raiders. At Obi-Wan's home, R2-D2 plays a recording of Princess Leia saying that R2-D2 contains the plans for the Death Star, the Galactic Empire's superweapon. Leia asks him to deliver the droid and the plans safely to the planet Alderaan in order to help the Rebel Alliance. Obi-Wan reveals his true identity and explains that he is a Jedi Master, a member of an ancient group of warriors that were hunted down and exterminated by his apprentice Darth Vader, the apparent killer of Luke's father. He gives Luke his father's lightsaber and asks him to accompany him to Alderaan and take up Jedi training. Luke declines, but after finding that his uncle Owen and aunt Beru have been killed by Imperial troops, he agrees to go with Obi-Wan to Alderaan and to train as a Jedi. In the spaceport city Mos Eisley, Obi-Wan uses the Force to trick Imperial troops into letting them through a military checkpoint. They enter a local cantina and make a deal with two smugglers, Han Solo and Chewbacca, to fly them to Alderaan aboard their ship, the Millennium Falcon. During the journey, Obi-Wan begins instructing Luke in lightsaber combat. He suddenly becomes weak and tells Luke of "a great disturbance in the Force". Emerging from hyperspace, the party finds that Alderaan has been destroyed by the Empire, and the Falcon is attacked by an Imperial TIE Fighter. The trio chases the TIE fighter to the Death Star, and subsequently get caught in the space station's tractor beam. On board the Death Star, Obi-Wan shuts down the tractor beam, but Darth Vader confronts him and they engage in a lightsaber duel. Obi-Wan uses the duel to distract Vader as Luke, Leia, Han and Chewbacca escape to the Falcon. Although Vader strikes Obi-Wan down, his body mysteriously vanishes the moment he dies. At the climax of the film during the Rebel attack on the Death Star, Obi-Wan speaks to Luke through the Force to help him destroy the Imperial station. In The Empire Strikes Back, Obi-Wan Kenobi appears several times as a spirit through the Force. On the planet Hoth, he appears to instruct Luke to go to the planet Dagobah to find the exiled Jedi Master Yoda. Despite Yoda's skepticism, Obi-Wan convinces his old master to continue Luke's training. He appears later to beseech Luke not to leave Dagobah to try to rescue his friends on Cloud City, although Luke ignores this advice. In Return of the Jedi, Obi-Wan again appears to Luke after Yoda's death on Dagobah. Obi-Wan acknowledges that Darth Vader is indeed Luke's father, revealed by Vader himself in the previous film and confirmed by Yoda on his deathbed, and also reveals that Leia is Luke's twin sister. After the Rebels destroy the second Death Star and defeat the Empire, Obi-Wan appears at the celebration on Endor, alongside the spirits of Yoda and the redeemed Anakin Skywalker (Vader's former Jedi self).

Using a quote from the above article, answer the following question: What other actions does he take in the series?
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Answer: Obi-Wan again appears to Luke after Yoda's death on Dagobah.

Question: Oingo Boingo was an American new wave band, best known for their hits "Dead Man's Party" and "Weird Science". They are noted for their high energy live concerts, movie soundtrack contributions, and their mixture of genre, which can be described as including ska, pop, rock, and world music. The band was founded in 1972 as The Mystic Knights of the Oingo Boingo, a performance art group. The band was led by songwriter/vocalist Danny Elfman, who has since achieved success as a composer for film and television.

With the move to MCA, the band made two personnel switches: Mike Bacich took over on keyboards from departing member Richard Gibbs, and John Avila replaced Kerry Hatch on bass. Oingo Boingo appeared in a number of soundtracks in the early to mid-1980s, including Fast Times at Ridgemont High, which features "Goodbye, Goodbye". Their song charting highest on Billboard Hot 100, "Weird Science", was written for the John Hughes film of the same name, and was later included on their 1985 album Dead Man's Party. Later, the band made an appearance playing their hit "Dead Man's Party" on stage in the film Back to School. In addition, they appeared in and performed several songs in the quirky 1984 Tom Hanks movie Bachelor Party, including "Who Do You Want to Be?", "Bachelor Party" and "Something Isn't Right". Then, starting with 1985's Pee-wee's Big Adventure, Danny Elfman began scoring major films with increasing frequency, including almost all of Tim Burton's films. Oingo Boingo's 1987 album BOI-NGO was released as a follow-up to the popular Dead Man's Party, but its chart performance was considered an underperformance. After this album, Bacich was replaced by new keyboardist Carl Graves. The band's 1988 release Boingo Alive was actually recorded live on a soundstage, with no studio audience; it consisted of a selection of songs from earlier albums, plus two new compositions. The Boingo Alive track "Winning Side" became a No. 14 hit on US Modern Rock radio stations. In 1990 the band released their seventh studio album, titled Dark at the End of the Tunnel.

Using a quote from the above article, answer the following question: what switches did they make?
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Answer:
Mike Bacich took over on keyboards from departing member Richard Gibbs, and John Avila replaced Kerry Hatch on bass.