Abstract: A method is presented that allows feedback to be given on a musical performance without restrictions on the performance in terms of quality of intonation, tempo, or specific note order. Based on standard musical exercises, the ability to rate a performance is tolerant to repeated and/or omitted notes, to varying tempo and to systematic tuning errors. The method is suitable for use on mobile devices and may provide real-time feedback to allow the performer to adjust their performance or monitor their progress during the performance. Since a wide range of proficiency is able to be rated to give an indication of how well the performer executed a musical exercise this allows very inexperienced musicians to feel a sense of accomplishment when practicing outside the teaching environment as well as giving more accomplished musicians the feedback they need for continuous improvement.