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O3 Austria Top 40 is the official Austrian singles chart , as well as the radio show which presents it , aired Fridays on Hitradio O3 .. Austria. Austria. Hitradio O3. Hitradio O3. The show presents the Austrian singles , ringtones and downloads chart .. It premiered on 26 November 1968 as Disc Parade and was presented by Ernst Grissemann .. Ernst Grissemann. Ernst Grissemann. The show has had other names and other presenters , as detailed below .. below. #Presenters. The weekly number-ones are released by Musikmarkt and go TV .. Musikmarkt. Musikmarkt. go TV. Go TV ( Austrian channel )