Let me also say that my co-teachers and I have had in-depth conversations about the songs we have selected because we want students to be able to determine the central idea of the songs. This frequently comes without a lesson, however we also use some of these song lyrics when teaching close reading to determine central ideas.
I should also point out that we use the one song to indicate which workshop is forthcoming. We always tried to keep our schedule as routine as possible, but we all know that is not always possible. When our students heard "Man in the Mirror", regardless of the time of day, they knew it was time for Reader's Workshop.
Without further ado...feel free to make a joyful noise!