John Carroll's concept of mastery learning (ML) is described, and an ML model which can be used by directors of music-performing groups is presented. According to Carroll, any student, when given direction and time to follow that direction, can move along a time line from a state of inability to a state of ability. Tasks defined in behavioral terms allow both the teacher and the student to judge when the task is completed. When time needed to learn a task equals time spent in learning, the learner is able to perform the task. Proponents of ML feel that 90 to 95% of all students can achieve mastery if proper teacher and student conditions for learning are present. Using Benjamin Bloom's model of ML and recommendations from other educators, a two part model--Planning for Learning and The Learning Experience--is presented. A discussion covering the following topics follows the model: establishing current performance levels, selecting new material, selecting instructional content, planning for instruction, planning for evaluation, planning for prescriptive design, and learning sequence. (RM)