The tonal variations and shades of a musical instrument (such as the guitar) are nearly infinite. From the choice of woods, to strings, to the musician's approach, each element helps create a rainbow of sound variations. Singers have their own infinite color choices, and vowel shadings are a significant source of variations for musical expression. In this episode, John discusses how to think of and approach vowels for maximum variety and suggests exercises to help find your musical color palate.