Boy, do I like the sound of that! Maps and music, it even alliterates. So when Maria Popova (who always posts really cool things on Twitter as brainpicker) mentioned a map where metro lines make music by crossing, I was interested. Alexander Chen created Conductor, an interactive string music instrument consisting of the New York subway lines (its actual schedule). Check this out, it is nicest to watch on the website www.mta.me, and then read more about it on the blog of Alexander. And if you keep the page open in another window while writing (for example a blog J ), it turns out the musical outcome is rather calming!