The Fender Jazz Bass (often shortened to J-Bass) is the second model of electric bass created by Leo Fender. It is distinct from the Precision Bass in that its tone is brighter and richer in the midrange and treble with less emphasis on the fundamental frequency. The body shape is also different from the Precision Bass, in that the Precision Bass has a symmetrical lower bout on the body, designed after the Telecaster and Stratocaster lines of guitars, while the Jazz Bass has an offset lower bout, mimicking the design aesthetic of the Jaguar and Jazzmaster guitars. History First introduced in 1960 as the Deluxe Model, it borrowed design elements from the Jazzmaster guitar. It was renamed the Jazz Bass as Fender felt that its redesigned neck—narrower and more rounded than that of the Precision Bass—would appeal more to jazz musicians. The Jazz Bass has two single coil pickups with two pole pieces per string. As well as having a slightly different, less symmetrical and more contoured body shape (known in Fender advertising as the "Offset Waist Contour" body), the Jazz Bass neck is noticeably narrower at the nut than that of the Fender Precision Bass. While the Precision Bass was originally styled similarly to the Telecaster guitar, the Jazz Bass' styling was inspired by the Jazzmaster guitar, with which the Jazz shared its offset body and sculpted edges, which differentiate it from other slab-style bass bodies. The original intention of the instrument was to appeal to upright bass players. The original Jazz Bass had two stacked knob pots with volume and tone control for each pickup. Original instruments with this stacked configuration are highly valued in the vintage guitar market. In late 1961, it received three control knobs: one volume knob for each pickup and a third to control the overall tone. Despite this new feature, many stacked knob models were made until about 1962. Another feature the initial models had were the "Spring Felt Mutes", which were present on basses from 1960 until 1962. The mutes were designed to dampen the overtones and the sustain; they were screwed in place between the bridge and aft pickup. Those felt mutes were not a tremendous success and were replaced by a cheaper, more simple foam mute glued underneath the bridge cover, as was used by the Precision Bass from 1963 onwards. Over the following years, as the use of mutes