Final answer:
A music therapist using the notion of 'know thyself' is likely drawing from ancient Greek philosophy to encourage clients' self-reflection and personal growth through their engagement with music.
Step-by-step explanation:
A music therapist who incorporates the aspects of 'know thyself' into their music therapy sessions is probably drawing upon philosophical principles, especially those originating from ancient Greek philosophy. 'Know thyself' is a maxim attributed to several ancient Greek philosophers such as Socrates and is an invitation for one to understand their own character, needs, and wants in a deeper sense. In the context of music therapy, the therapist is likely using this as a directive to help clients explore their own internal emotional landscapes and personal histories, encouraging self-reflection and personal growth through their engagement with music.
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