I listen to RPGamers internet radio (huge shoutout to them) which is a radio station that plays all video game music, which some will tell you is good for concentration because the songs are mostly instrumental, though there are a few that are vocal. There are two songs, however, that totally kill the concentration mood, one of them being the Deckard Cain Rap from Diablo and the Slaughterhouse Scramble from Beyond Good and Evil. The latter of these is one of the absolute worst things, if not the worst, you might ever hear from a station that focuses on concentration, and it's the only song on there with a consistent zero likes after songs stopped being added for the most part. The other one is just a regular rap, it's comedic and I find myself at the receiving end of a lot of sighs because I always request it for the uplift.