Before Detroit’s unprecedented $18.5 billion municipal bankruptcy filing July 18, Grammy-winning songwriter Allee Willis — whose work includes Earth, Wind & Fire’s “September” and “Boogie Wonderland,” and Pointer Sister’s “Neutron Dance” — co-wrote a soulful love song for her city with Andrae Alexander. They are encouraging all of Motor City to learn the lyrics for a great big singalong in September. The pair hopes to make “The D” Detroit’s unofficial theme song and will be making a music video and documentary of the event, featuring “thousands of Detroiters singing, playing, dancing, clapping, whistling, breathing fire, juggling hubcaps, and showing their spirit any way they can all over the city.” Sign up and learn the lyrics on the web site. — K.B.