What is "old skool"

a. (context slang eye dialect English) (alternative spelling of old school English)

1. redirect old school

Old Skool is an extended play (EP) by Dutch music producer and DJ Armin van Buuren. It was released on 4 August 2016 by Armada Music. van Buuren said of the album, "What i miss sometimes in dance music is a little bit of the fun, the fun that we had by experimenting and going out of our way and doing strange things. And that's what i wanted to do with Old Skool".