Problem: REO Speedwagon (originally styled as R.E.O. Speedwagon) is an American rock band from Champaign, Illinois. Formed in 1967, the band cultivated a following during the 1970s and achieved significant commercial success throughout the 1980s. Hi Infidelity (1980) contained four US Top 40 hits and is the group's best-selling album, with over ten million copies sold. Over the course of its career, the band has sold more than 40 million records and has charted thirteen Top 40 hits, including the number ones "

By the late 1980s, the band's popularity was starting to decline. Alan Gratzer left in September 1988 after he decided to retire from music to open a restaurant. In early 1989, Gary Richrath quit after tensions between him and Kevin Cronin boiled over. Cronin had been playing in The Strolling Dudes, a jazz ensemble that included jazz trumpet player Rick Braun (who had co-written the abovementioned "Here With Me" with Cronin), Miles Joseph on lead guitar and Graham Lear on drums. Lear had already been invited to join REO in September 1988 as Gratzer's successor and Joseph was brought in as a temporary stand-in for Richrath. Back up singers Carla Day and Melanie Jackson were also added. This lineup did only one show, on January 7, 1989 in Vina del Mar, Chile, where it won the award for best group at the city's annual International Song Festival. After that, Miles Joseph and the back up singers were dropped in favor of former Ted Nugent guitarist Dave Amato (who was brought aboard in May 1989) and keyboardist/songwriter/producer Jesse Harms.  The 1990 release The Earth, a Small Man, His Dog and a Chicken, with Bryan Hitt (formerly of Wang Chung) on drums, was a commercial disappointment. The album produced only one, and - to date - the band's last Billboard Hot 100 single, "Love Is a Rock," which peaked at #65. Harms, disenchanted by the album's failure, left the group in early 1991.  Shortly after his departure, Richrath assembled former members of the Midwestern band Vancouver to form a namesake band, Richrath. After touring for several years, the Richrath band released Only the Strong Survive in 1992 on the GNP Crescendo label. Richrath (the band) continued to perform for several years before disbanding in the late 1990s. In September 1998, Gary Richrath briefly joined REO onstage at the County Fair in Los Angeles to play on band's encore song, "157 Riverside Avenue". He then joined REO once again in Los Angeles in May 2000 for the same encore but no serious plans for a reunion ever materialized.  Having lost their recording contract with Epic, REO Speedwagon ended up releasing Building the Bridge (1996) on the Priority/Rhythm Safari label. When that label went bankrupt, the album was released on Castle Records, which also experienced financial troubles. REO Speedwagon ultimately self-financed this effort, which failed to chart. The title track did make R&R's AC Top 30 chart.

WHy did alan leave

Answer with quotes: after he decided to retire from music to open a restaurant.

Question:
Aaron Charles Carter was born on December 7, 1987, at the Tampa General Hospital in Tampa, Florida, where his parents, Jane Elizabeth (nee Spaulding) and Robert Gene Carter (1952-2017), ran the Garden Villa Retirement Home. The family was originally from New York City, where his older brother Nick, of the boy band Backstreet Boys, was born. In addition to his brother Nick, he also has three sisters: twin sister Angel (a model), B.J. and Leslie (1986-2012). Carter is named after his paternal grandfather, Aaron Charles Carter, and his maternal grandfather, Douglas "Charles" Spaulding.
Carter's next album, Another Earthquake!, was released on September 3, 2002, during the "Rock, Rap, and Retro" tour. The album featured the patriotic-themed "America A.O." and the ballad "Do You Remember". He guest starred on three episodes of the Nickelodeon TV show, All That and sang the theme song to the PBS animated series Liberty's Kids, titled "Through my own Eyes."  During that time, Carter's parents filed a lawsuit against his former manager, Lou Pearlman (now deceased), in 2002 alleging failure to pay hundreds of thousands of dollars in royalties on Carter's 1998 album, which was released through Pearlman's label and production company, Trans Continental. On March 13, 2003, Pearlman was declared in contempt of court for ignoring a court order to produce documents relating to royalty payments.  Carter had also dated Lindsay Lohan along with his girlfriend Hilary Duff at the same time (leading to a feud between the two), but he broke up with Lohan in April 2003, and resumed dating Duff. Later, that same year, he reportedly cheated on her and Duff ended their on-and-off relationship after two years. Carter's Most Requested Hits, a collection including tracks from his last three albums as well as a new single, "One Better", was released on November 3, 2003.  "Saturday Night", which was released on March 22, 2005 and was promoted by Carter during his summer 2005 Remix Tour. The song was released by Trans Continental label, with Lou Pearlman as executive producer. The single was also featured in the soundtrack of the film Popstar, in which Carter starred. The direct-to-video film was based heavily on his own life as a performer. A real-life motocross racer, Carter also appeared in 2005's Supercross. On March 21, 2006, Trans Continental filed a lawsuit against Carter within the Los Angeles Superior Court, citing that Carter allegedly reneged on a recording deal. Carter had signed the contract on December 7, 2004, when he was 17 and underage. His attorney however stated that Carter had the right to "cancel or void various agreements" that were signed when he was a minor.  Carter and his siblings starred in a reality show, House of Carters, which ran in October-November 2006 on E!. The series features all five Carter siblings reuniting to live in the same house. On September 18, 2006, it was reported that Carter was engaged to former beauty queen and Playboy model Kari Ann Peniche. US Weekly later reported that Carter had broken off his engagement to Peniche, saying he was impulsive in proposing to her.
Answer this question using a quote from the text above:

What was Saturday Night?

Answer:
"Saturday Night", which was released on March 22, 2005