Listening to music is good, but the best thing for most- if they are in the “walking” stage, is to walk, walk, walk. Give them a sandwich or finger foods to eat while you are walking. Offer liquids in a sippy cup or glass with straw if they are shaky- carry it along and offer it often. If you let us know which stage of Alzheimers he is in, it would be more helpful for letting you know about activities. (Because of the poor memory, reading is usually not too helpful- they are too restless for that, and can’t remember what the last few sentences were.)