This chapter provides an introduction to the evaluation of music activities and music therapy for people with dementia. We outline some of the main challenges and considerations involved in choosing or using outcome measures. An overview of common outcome measures used in current research, including those for behavioral and psychological symptoms, quality of life, physiological changes, cognitive function, and music-related behaviors, is provided. Two music-therapy case studies are presented as real-life examples of how to select clinically relevant measures. Clinicians have long argued that some clinically meaningful changes may not always be measurable. We propose that when insights obtained from high-quality qualitative and mixed methods studies are added to the evidence base of quantitative research, it will lead to a deeper understanding of the benefits that music can have in the lives of people living with dementia.