Open Format means multiple genres concentrating heavily on the Top 40 Charts. Disco, 80's, Hip-Hop, EDM, etc. The open format crowd is open-minded for genres, but they like to hear stuff they recognize. If you are a good DJ you can throw in some new stuff and make it work. It used to be called DJing.
Open Format does NOT mean beat juggling obscure drum and bass and getting kicked out the booth.
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