Mysteries and quandaries in stuttering:  Why do we not stutter when we sing?  If someone reads in unison with me I don't stutter! What is masking and how is it I don't stutter when I cannot hear myself?  I hear Emily Blunt, James Earl Jones, and Bruce Willis stutter in real life yet I have never heard them stutter when playing a character role!  These age-old mysteries are clinically important and can lead research.