Answer the question at the end by quoting:

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 "
The stage was now set for the height of the band's popularity. On November 21, 1980, REO Speedwagon released Hi Infidelity, which represented a change in sound, going from hard rock to more pop-oriented material. Hi Infidelity spawned four hit singles written by Richrath and Cronin, including the chart-topping "Keep On Loving You" (Cronin), plus "Take It on the Run" (#5) (Richrath), "In Your Letter" (#20) (Richrath), and "Don't Let Him Go" (#24) (Cronin), and remained on the charts for 65 weeks, 32 of which were spent in the top ten, including 15 weeks atop the Billboard 200. Hi Infidelity sold over 10 million copies and set the bar for rock bands across the country. The band's follow-up album, Good Trouble, was released in 1982. Although it was not as successful as its predecessor, the album performed moderately well commercially, featuring the hit singles "Keep the Fire Burnin'" (U.S. #7), "Sweet Time" (U.S. #26) and the Album Rock chart hit "The Key." The band came storming back two years later with Wheels Are Turnin', an album that included the #1 hit single "Can't Fight This Feeling" plus three more hits: "I Do' Wanna Know" (U.S. #29), "One Lonely Night" (U.S. #19), and "Live Every Moment" (U.S. #34). REO Speedwagon toured the US in 1985, including a sold-out concert in Madison, Wisconsin in May. On July 13, on the way to a show in Milwaukee, the band made a stop in Philadelphia to play at the US leg of Live Aid, which broke a record for number of viewers. They performed "Can't Fight This Feeling" and "Roll With the Changes," which featured members of the Beach Boys, the band members' families, and Paul Shaffer on stage for backing vocals. 1987's Life as We Know It saw a decline in sales, but still managed to provide the band with the top-20 hits "That Ain't Love" (U.S. #16) and "In My Dreams" (U.S. #19). The Hits (1988) is a compilation album from REO Speedwagon. It contains new tracks "Here With Me" and "I Don't Want to Lose You." "Here with Me" cracked the top 20 on the Billboard Hot 100 and the top ten on the Adult Contemporary chart. They were the last songs recorded with Gary Richrath and Alan Gratzer

What accounted for the mainstream success of the band?

Answer the question at the end by quoting:

Grace Beverly Jones (born 19 May 1948) is a Jamaican singer, songwriter, supermodel, record producer, and actress. Born in Jamaica, she moved when she was 13, along with her siblings, to live with her parents in Syracuse, New York. Jones began her modelling career in New York state, then in Paris, working for fashion houses such as Yves St. Laurent and Kenzo, and appearing on the covers of Elle and Vogue. She worked with photographers such as Jean-Paul Goude, Helmut Newton, Guy Bourdin, and Hans Feurer, and became known for her distinctive androgynous appearance and bold features.
Grace Jones was born in 1948 (though most sources say 1952) in Spanish Town, Jamaica, the daughter of Marjorie (nee Williams) and Robert W. Jones, who was a local politician and Apostolic clergyman. The couple already had two children, and would go on to have four more. Robert and Marjorie moved to the East Coast of the United States, where Robert worked as an agricultural labourer until a spiritual experience during a failed suicide attempt inspired him to become a Pentecostal minister. While they were in the US, they left their children with Marjorie's mother and her new husband, Peart. Jones knew him as "Mas P" ('Master P') and later noted that she "absolutely hated him"; as a strict disciplinarian he regularly beat the children in his care, representing what Jones described as "serious abuse". She was raised into the family's Pentecostal faith, having to take part in prayer meetings and Bible readings every night. She initially attended the Pentecostal All Saints School, before being sent to a nearby public school. As a child, shy Jones had only one schoolfriend and was teased by classmates for her "skinny frame", but she excelled at sports and found solace in the nature of Jamaica. Marjorie and Robert eventually brought their children - including the 13 year old Grace - to live with them in the US, where they had settled in Lyncourt, Salina, New York, near Syracuse. It was in the city that her father had established his own ministry, the Apostolic Church of Jesus Christ, in 1956. Jones continued her schooling and after she graduated, enrolled at Onondaga Community College majoring in Spanish. Jones began to rebel against her parents and their religion; she began wearing makeup, drinking alcohol, and visiting gay clubs with her brother. At college, she also took a theatre class, with her drama teacher convincing her to join him on a summer stock tour in Philadelphia. Arriving in the city, she decided to stay there, immersing herself in the Counterculture of the 1960s by living in hippie communes, earning money as a go-go dancer, and using LSD and other drugs. She later praised the use of LSD as "a very important part of my emotional growth... The mental exercise was good for me". She moved back to New York at 18 and signed on as a model with Wilhelmina Modelling agency. She moved to Paris in 1970. The Parisian fashion scene was receptive to Jones' unusual, androgynous, bold, dark-skinned appearance. Yves St. Laurent, Claude Montana, and Kenzo Takada hired her for runway modelling, and she appeared on the covers of Elle, Vogue, and Stern working with Helmut Newton, Guy Bourdin, and Hans Feurer. Jones also modelled for Azzedine Alaia, and was frequently photographed promoting his line. While modelling in Paris, she shared an apartment with Jerry Hall and Jessica Lange. Hall and Jones frequented Le Sept, one of Paris's most popular gay clubs of the 1970s and '80s, and socialised with Giorgio Armani and Karl Lagerfeld. In 1973, Jones appeared on the cover of a reissue of Billy Paul's 1970 album Ebony Woman.

When was he born?
1948