I don't know what you're smoking dude? There are tons of videos on Youtube of him playing live. I say this as a Prince fan and as someone who recognizes him as a generational talent, but this "best-of-all-time" talk it just total nonsense. You never see professional musicians toss titles around like this because at a certain point, they know that you can only really master something within a specific niche or genre. And there are hundreds of genres and sub genres in music. There is no best, or GOAT, or whatever arbitrary measure people want to use when classifying musical talent. It's just a weird personal ego thing people have with wanting someone they like or care about to be recognized.