Systems and methods applicable, for example, in music data repetition functionality. Timbral feature calculation and/or pitch feature calculation might, for instance, be performed. One or more self matrices might, for example, be calculated. A combined matrix might, for instance, be created. One or more music data repetition candidates might, for example, be selected. Candidate refinement might, for instance, be performed. A final choice for the music data repetition corresponding to the music data might, for example, be determined.