Color your CDs with a marker.

I guess some people still use compact discs, because CD STOPLIGHT, one of the audiophile-hoax products introduced decades ago, is still being sold. It’s a marker that you use to color the edges of your CDs, to make them sound better. (How does it work? It doesn’t, obviously.) At least it’s not the Wireworld 6-meter speaker cable, a pair of which sells for a bit more money. (Okay, a lot more money.)