Freewill by Rush

The message, while intellectual, is the key to summer fun. "I will choose a path that's clear, I will choose free will." Summer fun is about freedom and choice.

Plus, the insane guitar solo by Alex Lifeson doesn't hurt.

Living After Midnight by Judas Priest

"Living after midnight, rockin to the dawn
Lovin' til the morning, then I'm gone, I'm gone"

That is summer love. Summer friends. Summer itself. It is here, it is great, and then it is gone and it's a memory.

PS- LAM >>> Kiss's Rock and Roll All Night... No. Really.

Cheap Sunglasses by ZZ Top

Cheap sunglasses >>> designer shades. And if it's summer, you gotta have shades. They can be a headache remedy ("when the light is hurt your head"). They can be an aphrodisiac ("but what really knocked me out..."). They can be a disguise ("With the glass so dark, they won't even know your name.") And best of all, they are cheap.