The purpose of this study was to explore a microanalysis technique for measuring instrumentalists' self-regulation tendencies during music practice. A secondary purpose was to investigate whether an intervention informed by the features of the microanalysis technique would increase the students' self-regulated learning tendencies. Three undergraduate instrumental music education majors volunteered to participate in this study. This study was designed as a multiple-baselines experiment spanning 15 consecutive days. Data sources included (a) entrance interviews; (b) daily practice efficacy ratings; (c) data gathered from pre- and posttest microanalysis sessions; (d) detailed behavioral analyses of video-recorded, pre- and posttest practice sessions; and (e) a focus group exit interview. The microanalytic intervention designed for this study involved a coaching session in which a member of the research team explicitly drew attention to the affective, behavioral, and metacognitive qualities related to effective practicing during a student's practice session. The pretest microanalysis data revealed distinct learning profiles for each student that were corroborated with information from the other data sources. The intervention had modest effects that varied across participants, suggesting that it was useful for bringing to light and addressing individuals' specific self-regulatory deficiencies in a manner respective to their needs.