In my 35 years of teaching vocal improvisation, I've never encountered a student who, with some basic training, was truly incapable of scat singing. When faced with the prospect of using their voice to improvise, many students express unfounded feelings of fear and intimidation. Overcoming this psychological barrier adds another dimension of challenge to teaching improvisation. With that in mind, here are some simple, non-intimidating vocal exercises that I use to teach novice improvisers.
The Original Musical Instrument