I wouldn’t know how to choose the music, but my luxury item for Desert Island Discs would be easy: binoculars. My one objection is calling them a luxury. I’ve had a pair around my neck for what seems like most of the last 50 years.
It’s not only that you can see things more clearly: binoculars let you experience the living world as humans seldom do. A female adder, for example, went from the only formal shape in a random scatter of vegetation to a precise triple coil of black zigzags on brown.