Which 1976 album became the first-ever platinum-certified album by the Recording Industry Association of America?

Their Greatest Hits (1971–1975) is the first compilation album by the Eagles, released in 1976. The album contains a selection of songs from the Eagles' first four albums released in the period from the Eagles' formation in 1971 up to 1975. It is the best-selling album of the 20th century in the United States, and it stayed the best selling-album in the US for some years until it was surpassed by Michael Jackson's Thriller after the artist's death in 2009. It is the second highest-certified album by the Recording Industry Association of America at 29x platinum, behind Thriller.

The album has the distinction of being the first album to receive the RIAA platinum award, which was introduced in 1976 to honor album that shipped one million copies in the United States. It received its certification on February 24, 1976, a week after its release. It was certified at 29x platinum on 30 January 2006, signifying shipment of 29 million copies in the US.