The RIAA announced on Thursday that the group’s first compilation, Their Greatest Hits (1971–1975) (1976), had become the first LP in history to be christened quadruple diamond by the RIAA. That achievement, of course, is due to the Eagles’ greatest hits capping things off in 1975, a year before Hotel California came out, making it so you need both if you’re a real Eagles fan. For Eagles singer-songwriter Don Henley, who recognized another milestone (Greatest Hits came out nearly half a century ago on Feb. 17, 1976), quadruple diamond status is a cultural victory. “We are amazed and grateful.”The band is celebrating by rereleasing Greatest Hits on clear, heavyweight vinyl and performing another 12 gigs at the Sphere in Las Vegas. If you stream an album 1,500 times, and Eagles fans apparently have, that is now equal to one album sale.