Okla. Stat. tit. 59, § 59-889.8
When referral is required
A. Consultation and evaluation by a licensed music therapist
may be performed without a referral. Initiation of music therapy
services to individuals with medically related conditions shall be
based on a referral from any qualified health care professional who,
within the scope of his or her professional license, is authorized
to refer for health care services.
B. Prevention, wellness, education, adaptive, related and
specialized instructional support and services shall not require a
referral.