#2 – Pink Floyd – The Dark Side of the Moon
Frequently noted as one of the greatest albums of all time, The Dark Side of the Moon certainly left a strong impact in the world of music. This is exceptionally surprising, as the progressive rock genre is not one that is known to get huge commercial attention. The album managed to get a hold of the number one position on the Billboard 200 chart for just one week, but managed to stay on the chart for 855 non-consecutive weeks! It is the 8th best-selling album in the United Kingdom, and has sold over 45 million units worldwide.