In the world of guitar strings, perhaps no one is more influential than Stevie Ray Vaughan.
Most guitar players in the 60s and 70s played fairly light strings, by today’s standards at least (both Jimmy Page and Jeff Beck were known to play .008 gauge strings, Hendrix played custom 9s and 10s). When Stevie came around, getting fatter tone than anyone had ever heard from a strat, everything changed.
Stevie came into the fold playing .013s, which at the time were pretty much unheard of outside of the jazz guitar world. Electric guitar pickups operate magnetically, so the more magnetic material vibrating above the pickups, the higher the output. Once players got a load of Stevie’s tone, they did everything they could to catch up, and a generation of heavy gauge players was born.
By now, Stevie’s name is synonymous with super heavy strings, but there are a lot of misconceptions going around about what gauges he actually played, and what he had to do to make them work well on his guitar. Here's some information about his string types.