Fender Precision Bass
Leo Fender, the founder of Fender, had the idea in the 1940s to build a solid-body bass guitar. He wanted it to be easier to play than a double bass. He also wanted it to be smaller so it was easy to move. He got this idea when talking to guitarists who didn't have jobs. They said that they could have gotten jobs being bassists, but found the double bass too hard to play.