Pink Floyd's enigmatic, record-breaking album The Dark Side Of The Moon turns 50

Pink Floyd released one of the most influential and successful albums of all time in March 1973. (Supplied: EMI)

Few albums are as big as Pink Floyd's 1973 blockbuster The Dark Side Of The Moon.     

Estimated to be one of only four albums to have sold over 45 million copies worldwide, it's spent more than 970 weeks, or the equivalent of over 18-and-a-half years, in the Billboard top 200 album charts in the US, which is a record.