Best Work Music Genre

I think it varies on the way the music goes. If it's a constant calm melody witch does not vary in a big way (chord progression) than the brain has less efforts to do and concentrates less on following the music structure. As if the music is loud and complex to follow it takes over your thoughts. When I write or work or read I rather listen to some calm music like probably Coldplay (old albums) or The Feeling but when I do sport Electronic music boosts me more.