Summer Songs?

Gathering Summer songs to put on an Ipod playlist, I've come to realization that no one makes singles for Summer anymore. Most of the songs that I put on the playlist are from the 70's, 60's and 50's, with only one Justin Timberlake song from the 00's. The Summer song used to be an event. But they had to be about the season. Now songs become hits in the summer and aren't thought of years later as having do with sun, beaches, vacations or hot weather.