Relationship dynamics between students and teachers are an essential element of one-on-one teaching and learning in music schools. The purpose of this study was to investigate factors leading to student-teacher dyad dissolution in post-secondary music performance studios. A total of 30 students and 30 teachers were interviewed. Interview questionnaires contained closed-ended rating scales and open-ended questions. Unstructured responses were transcribed, coded by units that each represented a contributing factor to dyad dissolution, and then subjected to a frequency count to determine decisive factors leading to dyad dissolution. All factors were subjected to the Framework of Social Levels, which is based on four levels -- "Interpersonal," "Self," "Other," and "Outside." The majority of students' dissolution factors were attributed at the Interpersonal level, whereas the majority of teachers attributed dissolution to factors at the Student ("Other") level. Participants cited several factors leading to dyad dissolution including different expectations, different professional goals, poor communication, incompatible personalities, student commitment, teacher teaching abilities, lesson satisfaction, and lack of personal connection.