Children with severe multiple disabilities face numerous possibilities for enjoying music and participating in performance activities; however, the research practice for realizing these possibilities involves various difficulties. To understand the disabilities of children and their engagement with music, awareness of one's perception of disability is necessary for each practitioner-researcher. The researchers of the current study reflected on their personal views about disability and life histories and described and analyzed them through collaborative autoethnography (CAE). The study was conducted through the practice of combining electronic music equipment and traditional instruments as a music education project for children with severe multiple disabilities. The results demonstrated that the perceptions of the researchers about disability and their life histories interacted with and transformed their research practice. Additionally, the study highlighted how endeavors in CAE encouraged dialogue among researchers and deepened mutual understanding. The suggestions for researchers of music education practice with children with disabilities include analysis of disability from the first-person perspective and sharing of views among co-researchers.