With an increasing number of developed nations adopting elements of the social model of disability, early childhood intervention practice has evolved to place greater emphasis on an inclusive, ecological, and strength-based framework. Recent music therapy literature seems to align with this shift in policy and demonstrates how family-centered strategies can be promoted in homes. Although music therapy researchers have conducted studies in kindergartens and childcares, which are also fundamental naturalistic settings for children with disabilities, the overall breadth and nature of practice in these settings is unclear and has not been collated. This scoping review aims to identify the key characteristics of music therapy research in preschool settings that include children with disabilities, subsequently identifying key publication details, participants, therapeutic aims, outcome measures, study designs, preschool settings, delivery models, and choice of music therapy methods. A total of 19 peer-reviewed journal articles from 1988 to 2020 met inclusion and exclusion criteria, with more than half of the studies published during the last 15 years. Evaluation of these 19 studies reveals how funding policies and educational systems seem to inherently inform the application of music therapy research in early learning centers. Developmental perspectives and objectivist study designs underpin many of the included sources, with majority of the outcomes demonstrating music therapy’s positive impact upon a child’s development. Researchers outside of the United States should give greater focus to early childhood and collect data from preschools within their respective countries to broaden awareness on how music therapy can support children with disabilities in naturalistic settings.