Glenn Frey, the guitarist, singer and songwriter who co-founded the Eagles, whose country-tinged, melodic rock tunes, wistful love ballads, philosophical anthems, observations of the outlaw life and testaments to the wages of decadence made it perhaps the leading American band of the 1970s, died in January 2016 in New York City. He was 67. The Eagles, founded in Los Angeles in 1971 by Mr. Frey and the drummer and singer Don Henley, lived furiously in the musical spotlight for nearly a decade, pumping out hits that defined a post-Beach Boys California pop in the midst of an era that otherwise gave birth to both disco and punk. The band flamed out in 1980 and disbanded. It got back together 14 years later with its popularity barely subsided. Glenn Lewis Frey was born in Detroit on Nov. 6, 1948, and grew up in the suburb of Royal Oak. His father was an auto factory worker; his mother, as he described it in “History of the Eagles,” a 2013 documentary about the band, “baked pies at General Motors.” Survivors include his wife, Cindy, and three children, Taylor, Deacon and Otis.