There's really no mystery to why these things do well from a music standpoint in the modern era. Most bands have folks who do this kind of research for them. If you ride your success well and work the market to your advantage based on the more popular music choices of the era you're going to win. This isn't just a voice, its a choice in chord pattern, melody staging, etc. Some artists just do better than others for this fact alone. Music producers are the real MVPs in the game these days.