Oy vey, here goes...
EDM Rave! (music style and culture - electronic dance music event)
Backed by a Benjamin,
EDM raves are a booming business and cost money to put on. Benjamin is a http://en.wikipedia.org/wiki/Slang_terms_for_money
Used as an insult: I just can't win.
Lyrics in some EDM / Techo music contains slurs against homosexuals, black people, women, and just whatever you name it. There is even insult style lyrics directed to insult pretty much anyone. You can't win, because it's already in the lyrics, no matter what you say the song is already made and you can't change its course.
You might be surprised to find rocks in me,
Some EDM has elements Rock-N-Roll. You could also say it "Rocks"
Just as shocked as when you find me in a tree.
People often climb trees during outdoor EDM events. First time you see this, you might be quite shocked :P
I can get high when I get wild,
Some people definitely get high and wild during music events.
But making you nod is more my style.
People nod to the music
I am dark and I am light;
Raves often feature dark spaces. They also feature strobe lighting - flashes of light and then darkness.
cold tomorrow but hot tonight.
Music is hot tonight - everybody is active, and dancing, but tomorrow you are out cold possibly with a hangover