What you do is great. I do not have a problem with that. I actually do something similar with special needs people. My take is simple and I hope you agree. Rock and Blues etc is sung from the heart with unique feeling and guts. This cannot be taught. Anyone trying to instill discipline and structure spoils the natural feel and nuances. If you tame a wild stallion he ceases to be a wild stallion. I think it was Robert Johnson (very early blues singer) who said you cannot teach the blues you have to experience it.