With 2010-2017 I'll allow 3 songs per year (making 24 in total) that have pretty much defined each summer, for better or worse. That leaves one spare from any other year that I'll just choose at random. I know some will say silly things like "where is Carly Rae Jepsen????" because the answer is: topping charts in a parallel universe that is better than ours. These are just the most commercially successful choices (hopefully - I am only human and may miss a notable example).
I know some of these aren't THAT summery but they dominated their respective summers, so...
That preamble out of the way... the choices are:
2010
2011
2012
2013
2014
2015
2016
2017
(yes this is from a British perspective, sorry American friends x)