Good example to illustrate your point this. Whenever I listen to Danny Brown I think that. By any kind of objective measure it shouldn’t work and his voice is aesthetically horrible. But somehow it does and his stuff is really good!?
As you say, you don’t need many variables to make infinite variations - even if you don’t count all the additional intervals we could make between the standard musical notes. Pretty much all life on the planet is built from four DNA bases.
Fuck, even more so if you look at someone like Basinski where the variation is literally the physical disintegration of a short tape loop.
There’s more music out there than ever before and so it can feel harder to find the good stuff, but even with that in mind I made a playlist of favourite songs of 2019 for some friends recently. Had to stop at about 30 so it wasnt too long, but listening back I thought it was full of great stuff and I love that 70 years after popular music began we can still come up with musical ideas that sound fresh.
Hope I never tire of listening to old favourites, digging back through back catalogues and discovering new stuff.