What is the name of the design used to assess a client's baseline behaviors without music therapy intervention before treatment?

The design used to assess a client's baseline behaviors without music therapy intervention before treatment is referred to as baseline-treatment design. This approach is critical in establishing a clear understanding of the client's behaviors prior to the introduction of any therapeutic interventions, allowing for a comparison to be made after music therapy is implemented.

By gathering baseline data, the therapist can gauge the effectiveness of the music therapy by observing any changes in the client’s behaviors once the therapy begins. This process helps in establishing a causal relationship between the intervention and the behavioral changes, providing valuable insights into the client's progress and the efficacy of the treatment being applied.

In this context, other options focus on different methodologies or analysis types that may not specifically center on establishing an initial behavior state prior to an intervention, making the baseline-treatment design the most appropriate choice for this particular assessment purpose.