Possibly like a lot of other folks here, I discovered this phenomenon of "radio chatter" over "ambient electronic music" via http://youarelistening.to/ - I find it so helpful for concentration.
I came up with my own improvised "mixing desk" using tabs in a separate browser window (makes it easier to separate from your main work. The most common tab URLs are:
And finally, I overlay one or more of these over my own Spotify playlist of ambient sounds. It's public, so I'll plug it here. I put this on random and use a crossfade of 10 seconds.