The goal of this clinical trial is to learn about whether music therapy can ameliorate cognitive function, physical fitness and psychology in mild cognitive impairment and mild dementia population. The main questions it aims to answer are: 1. To build a model of multimodal music therapy. 2. To discuss the effect of twelve-week multimodal music therapy in ameliorating community-based elders with MCI and mild dementia. Main outcome variables: cognitive function (Montreal Cognitive Assessment Scale, trail making test, Saint Louis University Mental Status Examination). Secondary outcome variables: physical fitness (muscle strength, muscular endurance, flexibility, balance ability), depression.