Passage: 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 number-one albums, six Grammy Awards, and five American Music Awards, the Eagles were one of the most successful musical acts of the 1970s. Their albums Their Greatest Hits (1971–1975) and Hotel California rank first and third, respectively, among the best-selling albums in the United States, with 38 million and 26 million album units in sales. The Eagles are one of the world's best-selling bands, having sold more than 100 million albums. They were ranked number 75 on Rolling Stone's 2004 list of the 100 Greatest Artists of All Time.Their debut album, Eagles (1972), spawned three top 40 singles: "Take It Easy", "Witchy Woman", and "Peaceful Easy Feeling". Desperado (1973) was less successful, only reaching number 41 on the charts; neither of its singles reached the top 40. However, its songs "Desperado" and "Tequila Sunrise" became two of the band's most popular tracks. On the Border (1974) added guitarist Don Felder and produced two top 40 singles: "Already Gone" and the Eagles' first number one, "Best of My Love".

Question: when was the rock band The eagles formed?
1971