Problem: Background: The New York Dolls were an American hard rock band formed in New York City in 1971. Along with the Velvet Underground and the Stooges, they were one of the first bands of the early punk rock scenes. Although their original line-up fell apart quickly, the band's first two albums--New York Dolls (1973) and Too Much Too Soon (1974)--became among the most popular cult records in rock.
Context: Sylvain Sylvain and Billy Murcia, who went to junior high school and high school together, started playing in a band called "the Pox" in 1967. After the frontman quit, Murcia and Sylvain started a clothing business called Truth and Soul and Sylvain took a job at A Different Drummer, a men's boutique that was across the street from the New York Doll Hospital, a doll repair shop. Sylvain said that the shop inspired the name for their future band. In 1970 they formed a band again and recruited Johnny Thunders to join on bass, though Sylvain ended up teaching him to play guitar. They called themselves the Dolls. When Sylvain left the band to spend a few months in London, Thunders and Murcia went their separate ways.  Thunders was eventually recruited by Kane and Rick Rivets, who had been playing together in the Bronx. At Thunders' suggestion, Murcia replaced the original drummer. Thunders played lead guitar and sang for the band Actress. An October 1971 rehearsal tape recorded by Rivets was released as Dawn of the Dolls. When Thunders decided that he no longer wanted to be the front man, David Johansen joined the band. Initially, the group was composed of singer David Johansen, guitarists Johnny Thunders and Rick Rivets (who was replaced by Sylvain Sylvain after a few months), bass guitarist Arthur "Killer" Kane and drummer Billy Murcia.  The original lineup's first performance was on Christmas Eve 1971 at a homeless shelter, the Endicott Hotel. After getting a manager and attracting some music industry interest, the New York Dolls got a break when Rod Stewart invited them to open for him at a London concert.
Question: Was it successful?
Answer: 

IN: Saosin is an American post-hardcore band from Orange County, California, United States. The band was formed in 2003 and recorded its first EP, Translating the Name, that same year original vocalist Anthony Green left Saosin due to personal reasons. In 2004, Cove Reber replaced Green as vocalist after auditioning for the role. The group recorded its self titled debut album which was released on Capitol Records on September 26, 2006.

After the audition process and several guest vocalists on demos, the then 19-year-old Cove Reber was announced as their new permanent lead singer. Reber had sent in his demo tape, which was an acoustic demo with "Mookie's Last Christmas". The demo has since leaked onto the internet. It is widely speculated to have included a few songs from Translating the Name. When Beau Burchell first heard the demo, he thought it was Anthony playing a trick on them, as Reber's vocal stylings were very similar to those of Green's when the demo was originally recorded.  In an interview with PlayPro.com, Reber commented that "everyone I've played with wants to make music their lives...Saosin is a band on a completely different level. All these dudes are freaks about music."  Reber's addition to the band was difficult, for the more experienced Green was the center piece of the band in the eyes of Saosin's fans. Many fans consider the time with Green to be something entirely different from the time with Reber. There are still distinct fans of both eras (Green Era/Reber Era) debating on which is a better fit for the band as a whole.  Saosin played the Taste of Chaos tour the following winter. Saosin was signed to Capitol Records in March and toured the United States with the Warped Tour for the second time. That summer, they released the Saosin EP. At first it was intended to be a free sampler, but Capitol Records would not allow this and released it as an EP. It contained demo versions of songs later recorded on their first full-length album. A video to their new single "Bury Your Head" was filmed during the tour. The band continued touring for the rest of 2005, opening for Avenged Sevenfold and Coheed and Cambria.

Did they replace anyone else in the band ?

OUT: 

Background: AKB48 (pronounced A.K.B. Forty-eight) are a Japanese idol girl group named after the Akihabara (Akiba for short) area in Tokyo, where the group's theater is located. The group has expanded since then to include over 130 members as of December 2015, aged from their early teens to their mid-20s. AKB48's producer, Yasushi Akimoto, wanted to form a girl group with its own theater (unlike pop groups performing occasional concerts and seen on television) and performing daily so fans could always see them live. This "idols you can meet" concept includes teams which can rotate performances and perform simultaneously at several events and "handshake" events, where fans can meet group members.
Context: In October 2006 AKB48 announced auditions for Team B, and 13 girls were chosen out of 12,828 applicants in December. The group's first DefStar Records single, "Aitakatta", was recorded by 20 members of Teams A and K and released on October 25. It debuted at number 12 on the Oricon weekly singles chart, selling 25,544 copies in its first six weeks, and remained on the chart for a total of 65 weeks. On November 3-4 AKB48 performed its first concert, "AKB48 First Concert: Aitakatta ~Hashira wa Nai ze!~" at Nippon Seinenkan in Shinjuku. The group performed "Aitakatta" on the New Year's Eve TV program 58th NHK Kohaku Uta Gassen as a part of the "Nihon ga Hokoru Saisentan! Special Medley". At 43 members, the group set a program record for the most people in one group onstage simultaneously. AKB48 made its first lineup change in December, transferring Kazumi Urano, Shiho Watanabe and Natsumi Hirajima from Team A to Team B as supporting members.  AKB48's second major-label single, "Seifuku ga Jama o Suru", was released on January 31, 2007 and debuted at number seven on the Oricon Top 10 chart. Its music video and lyrics hinted at the subject of enjo kosai (compensated dating, remotely related to escort services outside Japan), triggering controversy and negative reviews. On March 18 AKB48 released "Keibetsu Shiteita Aijo"; debuting at number eight on the Oricon chart, it dropped to number 98 in its second week. The group's second concert, "AKB48 Haru no Chotto dake Zenkoku Tour ~Madamada daze AKB48!~" on March 10, had poor ticket sales.  In April 2007 AKB48 posted its Team B roster on its website, with five fewer members than originally announced; for the first time, its membership numbered 48. The group's fourth single, "Bingo!", was released on July 18. AKB48's sixth single, "Yuhi o Miteiru ka?", was released on Halloween 2007 and sold 18,429 copies (the least of all the group's singles).
Question: Did they release anything else in 2007?
Answer:
On March 18 AKB48 released "Keibetsu Shiteita Aijo";