1. A smart speaker
Smart speakers are all the rage in home gadgetry right now. If your dad is an Apple aficionado he'll have to wait a bit to get his smart speaker of choice, but Google- and Amazon-loving fathers are in luck.
Dads who have an Android phone will get the most out of Google Home. It uses the same virtual assistant that lives in other Google-powered devices, so all you'll have to do is set it up so your dad can stream music and play Twenty Questions to his heart's content.
If your father is a frequent Amazon shopper you should consider getting him one of the multiple Amazon Echo models. Prices and features vary, so you should be able to find the perfect match.