The purpose of this study was to investigate intermediate musicians' self-regulated practice behaviors. Thirty sixth- through eighth-grade students were observed practicing band repertoire individually for 20 min. Practice sessions were coded according to practice frame frequency and duration, length of musical passage selected, most prominent musical objective, and practice behaviors. The 600 min of video were parsed into 234 practice frames for analysis. Practice sessions also were rated for overall degree of self-regulation. Reliability of the observational procedures (three observers, 95% to 100% agreement) and self-regulation ratings (two raters, coefficients of 0.89 to 0.96) was excellent. Analyses revealed an average of 7.8 practice frames with a mean duration of 2 min 45 s across sessions. Participants most frequently addressed the musical objective pitch accuracy and most commonly selected passages of nine measures in length or greater. The most common practice behaviors were varying tempo, repeating fewer than four measures, repeating more than four measures, and irrelevant playing. Significant relationships were found between self-regulation ratings and frequencies of the behaviors writing on music (r = 0.55), varying tempo (r = 0.42), repeating four or more measures (r = 0.41), and irrelevant playing (r = 0.59). Implications for future research and practical applications are discussed. (Contains 1 table and 1 figure.)