My theory is that the defining song of any decade will be released in its second year, i.e. the one ending in the number 1. However, I'm struggling to think of how this may be proved for the last decade, the name of which is a too hot a potato for me to tackle whilst I'm busy theorising.
Here's what I've got so far:
1980s defining song: The Specials - Ghost Town
1990s defining song: Massive Attack - Unfinished Sympathy
2000s defining song: ?
2010s defining song: Rebecca Black - Friday
Any fellow music scientists able to help me develop this? No time-wasters.