"Only 29 albums in history have sold more than 15 million copies — here they all are:
* Out of 127 diamond-certified albums, only 29 have sold 15 million copies or more (according to the RIAA).
* The best-selling album of all time in the US is "Their Greatest Hits (1971–1975)" by the Eagles.
* The Beatles, Pink Floyd, Led Zeppelin, Garth Brooks, and the Eagles all have more than one album on this list." - insider.com