The purpose of this study was to review flow research in music contexts from 1975 until the first quarter of 2019. Specifically, frequencies/percentages were calculated for (a) output in five-year periods; (b) publication type; and (c) methodologies employed, including measurement instruments used. Content analyses were also conducted on topics covered. Using the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) methodology, a total of 3,341 records were examined, with 95 studies eventually included in the analysis. Findings indicated a steady increase in research output over the last 25 years. Studies overwhelmingly sampled participants from Western populations, especially the United States. The majority of quantitative studies used self-report questionnaires, of which those developed by Jackson and colleagues were most prevalent. Among the qualitative approaches, interviews and observations were the most common means of data collection. Topics covered in the studies reviewed include the psychophysiological aspects of flow, transmission and group experience of flow, the association of flow with a range of positive outcomes, factors that contribute to flow experiences, and flow experiences of young children. Implications for future research were proffered in light of the findings.