Speaking of homework

The J. Geils Band covered this song, I used to be in a blues band that played this song, but "Homework" was made famous by Otis Rush.  Like B.B. King, Otis did not play guitar while he sang. Both virtuosos, I have to believe they could,  but B.B. never has, and Otis did not - don't even know if he's still with us. But "Homework" is: