Answer by taking a quote from the following article:

The Eagles are an American rock band formed in Los Angeles in 1971. The founding members were Glenn Frey (guitars, vocals), Don Henley (drums, vocals), Bernie Leadon (guitars, vocals) and Randy Meisner (bass guitar, vocals). With five number-one singles, six Grammy Awards, five American Music Awards, and six number-one albums, the Eagles were one of the most successful musical acts of the 1970s. At the end of the 20th century, two of their albums, Their Greatest Hits (1971-1975) and Hotel California, were ranked among the 20 best-selling albums in the United States according to the Recording Industry Association of America.

The Eagles went into the recording studio in 1977 to begin work on their next album, The Long Run. The album took two years to complete. It was originally intended to be a double album, but the band members were unable to write enough songs. The Long Run was released on September 24, 1979. Considered a disappointment by some critics for failing to live up to Hotel California, it proved a huge commercial hit nonetheless; the album topped the charts and sold seven million copies. In addition, it included three Top 10 singles. "Heartache Tonight" became their last single to top the Hot 100, on November 10, 1979. The title track and "I Can't Tell You Why" both reached number 8. The band won their fourth Grammy for "Heartache Tonight." "In The City" by Walsh and "The Sad Cafe" became live staples. The band also recorded two Christmas songs during these sessions, "Funky New Year" and "Please Come Home for Christmas," which was released as a single in 1978 and reached number 18 on the charts. Frey, Henley and Schmit contributed backup vocals for the single release of "Look What You've Done to Me" by Boz Scaggs. A different version with female backing vocals appears on the Urban Cowboy soundtrack, along with the Eagles' 1975 hit "Lyin' Eyes." On July 31, 1980, in Long Beach, California, tempers boiled over into what has been described as the "Long Night at Wrong Beach." The animosity between Felder and Frey boiled over before the show began, when Felder said, "You're welcome - I guess" to California Senator Alan Cranston's wife as the politician was thanking the band backstage for performing a benefit for his reelection. Frey and Felder spent the entire show telling each other about the beating each planned to administer backstage. "Only three more songs until I kick your ass, pal," Frey recalled Felder telling him near the end of the band's set. Felder recalls Frey telling him during "Best of My Love," "I'm gonna kick your ass when we get off the stage." It appeared to be the end of the Eagles, but the band still had a commitment with Elektra Records to make a live record from the tour. Eagles Live (released in November 1980) was mixed on opposite coasts. Frey had already left the band and would remain in Los Angeles, while the other band members each worked on their parts in Miami. "We were fixing three-part harmonies courtesy of Federal Express," said producer Bill Szymczyk. Frey refused to speak to the other Eagles, and he fired Irving Azoff as his manager. With credits that listed five attorneys, the album's liner notes simply said, "Thank you and goodnight." A single released from the album - "Seven Bridges Road" - had been a live concert staple for the band. It was written by Steve Young in an arrangement created by Iain Matthews for his Valley Hi album in 1973. The song reached number 21 on the charts in 1980, becoming the Eagles' last Top 40 single until 1994.

how well did it do?
the album topped the charts and sold seven million copies.