Sigmund Freud is credited with being the first person to use talking therapy through his development of psychoanalysis in the late 19th century.

There are many different forms of therapy which might help alleviate the symptoms of cerebral palsy. These include physical therapy to help the joints and muscles, speech and language therapy to assist in talking, and also occupational therapy.

A lisp or "talking with your tongue" is a type of speech impediment that can be lessened or removed altogether. Speech therapy can aid in this process.

A neuro intergration therapy has a few job duties. Some of the duties are talking, listening and try to work out issues.

You may be able to do this, but you will not be able to practice as a music therapist. Also, you need a masters degree in art therapy to practice art therapy.

I recommend talking to a professor at the schools you are looking at. They will be able to specifically advise you what to do.