Karol XVII & MB Valence, who have been present on the market for over 10 years, deal with various tasks connected mostly with music in their everyday life. They are producers, DJs, composers, lyrics writers and sound engineers. Appreciated worldwide for compositions, remixes, DJ sets and the technical quality of productions. Recognized by DJ MAG as the best Polish DJs of 2008. Nominated for The Beatport Music Awards 2010 as Best Deep House Artist besides the likes of Gorge, Milton Jackson, Jimpster and Nick Curly. Founders of an independent label Loco Records, which appeared in top 10 of Beatport's Best of 2010 - Deep House charts with three of its productions. Owners of a relatively young label Loco Records Supreme, supported by the top artists in this industry, e.g.: Hernan Cattaneo, Ben Watt, John Digweed, Nick Warren, Groove Armada, Trentemoller, X-Press 2, Osunlade, Aki Bergen, The Timewriter, Richie Hawtin, Mousse T., DJ Sneak, Roger Sanchez, Brothers’ Vibe, Alex Niggemann, Pezzner, Jon Cutler, Chris Lattner, Gorge, DJ Chus, Eelke Kleijn, Neil Quigley, Loko or Franck Roger. Creators of sounds appearing on such labels as I Records, Neurotraxx or their own Loco Records. Involved in cooperation with the following producers recognized throughout the world: Shur-I-Kan, Pezzner, Aki Bergen, Kevin Yost, Milton Jackson, Robert Owens, The Timewriter, Gorge, Florian Kruse, Nils Nuernberg, Miguel Migs or Mateo & Matos. Included in DJ sets, radio playlists, compilations, reviews, interviews and features in various music magazines. Getting constant support from the likes of Maceo Plex, Nick Curly, Tom Middleton, Steve Bug, Jimpster, Oliver Koletzki, Moodymanc, Satoshi Tomiie, Hector Romero, Ralf Kollmann, DJ Sneak, Neil Quigley, Mark Knight, Funk D'Void, Eelke Kleijn, Tom Budden, Noir, Dubfire, Brothers' Vibe, The Timewriter, Laurent Garnier, Leigh Morgan, Franck Roger, Catz n Dogz, Sasse, Darius Syrossian, Marcin Czubala, Hideo Kobayashi, Osunlade, Franck Roger, Roger Sanchez, Chopstick & Johnjon, James Teej, John Digweed, Eelke Kleijn, Aki Bergen, Shur-I-Kan, Kevin Yost, Gorge, Fred Everything, Estroe, Edu Imbernon, Paul Van Dyk, Oliver Smith, Pan-Pot, Jose Padilla, James Jackson, Kolombo.