Mershi give me some time. I have a Summer Jam List on my Spotify but I don't have access to it right now. As for now I can think of the following
ASAP Rocky feat. Lana Del Rey-Ridin(She was MADE for Rap Hooks.)
Real Estate-It's Real(the catchiest indie pop song on years)
M83-Midnight City
Will Smith-SummerTime
LEN-Steal my Sunshine
Walk The Moon-Anna Sun(still the catchiest song of the year)
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Realo won gold at the Sex Olympics with a BROKEN FRIGGIN NECK.-Voltch