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The Obscene Extreme festival, shortened as OEF, is an annual music festival in the Czech Republic, that focuses on extreme metal subgenres grindcore and death metal, as well as hardcore punk. It was found in 1999 as a birthday party by Miloslav "Čurby" Urbanec. It was described by Vice as "Europe's craziest grindcore party". It is noted by the Czech Radio for its "exceptionally tolerant and friendly atmosphere". The festival offers exclusively vegetarian and vegan food within its premises since its inception.
Several well-known metal bands have performed at OEF over the years, such as: Napalm Death, Possessed, Obituary, Sodom, Immolation, Grave, Suffocation, Vader, Incantation, Terrorizer, Exhumed, Asphyx, Morgoth, Brujeria, Sinister, Nuclear Assault, Hirax, Vital Remains, Eyehategod, Krisiun, and Municipal Waste to name a few.

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During the two days of the festival, the city becomes a music center and as such introduces its visitors to jazz as originally non-European genre, which, however, has conquered all major musical stages in the world since its inception. In Slaný, top Czech and foreign musicians introduce themselves to the audience. The festival is intended not only for fans of jazz art, but also for the general public. The festival begins with the opening of the gates of the Grand City Center and the chapel of the Museum of National History in Slaný. Then begins a show of concerts with quality jazz, blues, soul, funky and other similarly tuned music, which can inspire both professionals and the lay music public every year.

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A festival that can combine well-being and romance by the water with great projects that are not at other open air events, great bands, time for the family and a great party!

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