Simplify the following text for a Grade 9 native English-speaking person.
Original: Traditional bass designs such as the Fender Precision Bass and Fender Jazz Bass remained popular in the first decade of the 21st century ; in 2006 , a 60th Anniversary P-bass was introduced by Fender , along with the introduction of the Fender Jaguar Bass .
Simplified: Leo Fender called the instrument the `` Fender Precision Bass '' .