 To generalize previous results showing that non pharmacological therapy based on musical interventions improved emotional state in patients with severe AD to a larger sample of patients and to demonstrate the possible effects on caregivers, the investigators carried out a randomized controlled study with three parallel arms in institutionalized patients with severe AD study 1 and in patients with mild AD leaving at home study 2 to compare the impact of two interventions, a musical and a non-musical cooking, to a control group without any intervention. The control activity cooking was selected because it shares different features with music. Both interventions provide pleasure, are multisensory and may trigger old memories. In addition, both activities can be carried out in groups. A protocol consisting of various selected tests and questionnaires was used to assess the emotional, behavioural and cognitive abilities. Professional and familial caregivers also filled out other questionnaires to assess potential indirect benefits from both interventions on caregiver burnout and familial caregiver burden. Six assessments were proposed, two before, two during and two after interventions follow-up to respectively evaluate short and longer-term benefits of both interventions whereas test -retest effects will be controlled. Psychologists in charge to these assessments will be blind in regard to patients group musical versus cooking sessions, no intervention. Data were analyzed with methods from social psychology to decode non-verbal behaviours e.g. visual contact and emotional indexes in facial and verbal expressions and with methods from classical neuropsychology and from health domain. The collaboration between the two university teams from Lille and the special care unit Pole EHPAD-USLD in Reims Hospital provided complementary skills to this project that ensured its feasibility. 