Each music therapy encounter is inherently multicultural as both music therapists and clients bring unique cultural variables, including diverse musical traditions, into the music therapy room. Literature indicates that it is important for music therapists to examine their own musical backgrounds and identities so that they may better understand how their own socially and culturally constructed tastes, assumptions, values, and biases about music are impacting their clinical work. The purpose of this heuristic self-inquiry was to examine the researcher’s identity as a jazz manouche musician and gain insight into how this has influenced his emerging music therapist identity. Data collection involved self-reflexive journaling in response to six recorded improvisations––three meant to reflect the researcher’s jazz manouche musician identity and three meant to reflect his music therapist identity. The researcher then created two narrative summary descriptions: one outlining the core components of his current jazz manouche musician identity and one outlining core components of his emerging music therapist identity. Further analysis revealed themes that fell within four overarching categories: similarities and differences between the researcher’s jazz manouche musician and music therapist identities; how his jazz manouche musician identity is influencing his music therapist identity; and how the latter is influencing the former. Themes were explicated using brief descriptions, journal excerpts, and audio excerpts from the improvisations. The process and results helped the researcher to gain insight into how his unconscious musical assumptions may both complement and conflict with the musical beliefs and preferences of his clients. Furthermore, he realized that continuous striving toward musical reflexivity is an integral part of maintaining his own musical authenticity within the context of music therapy and music performance multicultural encounters. Additional personal, clinical,  educational, and research implications of the results are presented.