The purpose of this study was to measure the quantity, quality, and types of collaboration amongst K-12 music teachers in the state of Iowa. Survey responses (N = 97) were analyzed and grouped according to teacher characteristics. This sample of music educators reported the least collaboration on post-instruction, evaluative activity, such as reviewing assessments, data collection and analysis, and peer-observation. Respondents rated other parts of the collaborative process, such as group dialogue, decision-making, and action-taking, more highly. Teachers with a higher level of education reported more collaboration than less educated counterparts, while band teachers reported lower levels of collaboration quality compared to their choral and general music peers. Respondents also indicated that collaboration tends to increase with job continuity, but declines somewhat after teachers reach 25 years in the same school. Middle school teachers indicated the highest levels of collaboration, while K-12 teachers reported the lowest. Further, those teaching in larger schools recorded higher levels of collaboration than their smaller school colleagues. These results suggest that this group of K-12 music teachers in Iowa engage in moderate levels of collaborative activity overall and moderate to low levels of evaluative activity. Demographic results also reveal strengths and weaknesses of various subgroups' collaborative habits. Researchers have found that high quality teacher collaboration improves teaching and learning outcomes. These results have implications for administrators providing professional development, preservice teacher educators, professional organizations, and current practitioners in the field who desire to implement more and higher quality collaboration for the purpose of instructional improvement.