Final answer:
True, a music therapist can guide a client to self-express through piano improvisation even without previous musical experience, as therapeutic sessions are tailored to promote emotional expression through accessible techniques.
Step-by-step explanation:
The statement that a music therapist (MT) can support a client to self-express through improvising on the piano, even if the client doesn't have previous experience playing the piano, is true. Music therapy sessions are designed to facilitate self-expression, promote mental and emotional health, and do not necessarily require the client to have musical skills. The music therapist guides the client using various techniques that enable them to participate in music-making, such as improvisation, which can be an effective therapeutic tool regardless of the client's instrumental proficiency.