The goal of this Multicenter observational pilot study is to Compare the specifics of musical engagement (behaviors related to music in everyday life) in subjects aged over 60 with Alzheimer s disease, Parkinson s disease and control subjects. The main questions it aims to answer are: 1. The description of different profiles of musical engagement in early-stage AD, in PD and in healthy elderly subjects. 2. The extent of executive, mnestic and hedonic dysfunctions will impact differently on emotional engagement, autobiographical evocation and sensitivity to musical reward, and will therefore enable distinct profiles to be drawn up. Participants will have an intervention consisting of an interview with a neuropsychologist lasting approximately 2 hours, including : * A semi-structured interview to check the participants eligibility and gather demographic data. * Neuropsychological tests and questionnaires will then be administered. * A relative of the study participant will help complete questionnaires.