You can't really move on Youtube for random mashups of 'The A Team versus Wet Wet Wet' or 'Dr Dre versus Gazza' (these aren't real, but they should be). 99% of the time, they suck.
Step up then, Robin Skouteris who has put together a mixture of 56 tracks from 2013 into one long, and pretty bloody impressive track. Whether you like pop music or not, you'll definitely appreciate the skill on show here.
Enjoy.