Cyberpunk, the influential tabletop role-playing game released by Mike Pondsmith in 1988, has an all-too-familiar premise. In the game’s alternate timeline, global war has left the planet in tatters. People fend for themselves using futuristic weapons and cybernetic implants, with many eking out a living as outlaws and mercenaries. Megacorporations hold the power—any remaining governments skew authoritarian. The classic post-apocalyptic tropes are all there, but Pondsmith fleshed out his rain-soaked, neon-lit universe with “rockerboys,” a movement of musicians-turned-revolutionaries l...