AC/DC’s landmark album Back in Black turns 42 today (July 25,) and it remains one of the best-selling albums of all time.

How successful is this LP? It’s only one of 12 titles in the United States to be certified “Double Diamond” by the Recording Industry Association of America (RIAA), meaning it’s moved more than 20 million units.

Which other titles join Back in Black in this illustrious club? Scroll through the images below to find out and to see the staggering sales figures of these iconic titles!