This study aims to examine the effects of music activities on depression and sleep quality among frail older adults, and to develop a standardized music activity protocol suitable for use in adult day care centers. A randomized controlled trial (RCT) design will be used. Participants will be recruited from 4 to 5 adult day care centers and randomly assigned to either an intervention group (receiving music activities twice per week, one hour per session, for eight weeks) or a control group (receiving only routine activities). Depression and sleep quality will be measured at baseline, week 4, and week 8. Assessments will include validated questionnaires and the index of osteoporotic fractures. Data analysis will evaluate the effectiveness of music activities in improving depression and enhancing sleep quality.