When it comes to creativity and problem solving at the development level, I find that like others here, either no music or classical music on low volume assists the concentration. Beethoven, Bach, and Mozart, etc. I truly find classical helpful... I read once that it actually stimulates the proper receptors in the brain that involve critical thinking, but I'm unable to find that link as a source. I stumbled upon classical years ago at random I think... I never liked it before then and I'm certain for some it can be an acquired taste.