What are the songs that define the 1990s?

A great article in The Pudding about the songs that define the 1990s, not necessarily the best music from the decade, rather the songs that the people recognize the most. Some of the most recognized songs are Britney Spears' '...Baby One More Time', Spice Girls' 'Wannabe', R.E.M.'s 'Losing my Religion', although they vary slightly depending of the year of the birth. Great graphs in the article as well.