I conducted a case study to explore preservice music teachers' behaviors, thoughts, and feelings when engaged in collective free music improvisation. Nine preservice music teachers were taught how to freely improvise within groups as part of a teacher education course and participated in interviews and focus group discussions. Major themes highlighted learning across three segments that emphasized communication and collaborative skills, entrepreneurial skills and risk taking, and reconciliation and transformation. I concluded that the sociomusical outcomes produced by collective free improvisation may complement those of more formal and idiomatic improvisation practices, and that by introducing preservice music teachers to free improvisation activities, they may be more willing to engage PK-12 students in free improvisation lessons that enhance the existing school music curriculum.