Music this week comes from the Kronos Quartet http://www.kronosquartet.org/about
I saw them in concert many years ago and they were excellent. Some of their choices of music are unwise in my view, trying to play the music of Bill Evans for example doesn't really work in the context of a string quartet. (A piano is not a 'string' instrument, it belongs in the percussion section of an orchestra.) And playing 'Purple Haze' is ill-advised, however much they may like the original version. But overall they do produce wonderful music.
It was interesting to hear them in a Q&A session after the concert, to hear their 'philosophy' of their open approach to all types of musical genres. It was also interesting to hear them say that they would never change to using electrically amplified versions of their instruments. Some things are quite rightly sacrosanct!