@kr4 It defies any sort of logic that hand-rolled Ethernet cables would actually be better than machines built cables (or even work at all). As you obviously know, the whole idea of a machine twisted pair cable would be to eliminate variations in the twists and overall construction of the cable. Without those precise twists in the cable, you will have a problem.
Rolling them by hand would be like building a kit car on a Beetle chassis and then entering it into Formula 1 race and then acting surprised when it doesn’t even qualify.
As to Cat 8, it’s unnecessary. It’s not "noisy" as it can do 40GB/S, but it won’t work better, since the fastest internet widely available in the US is around 1GB/S.
In fact, Music requires very little bandwidth; WiFi will work just fine. Most streamers will support both. Have a friend switch them without telling you what he chose and see which you like best. Or if you can tell the difference.