Serial Number Z0026649, Corona California, Great Condition, Needs New Strings, Featuring Original Hard Case, Tuner, and More. The Jazz Bass (or 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. It has a more focused tone than the Precision Bass, with less low end and low midrange. Because of these tonal characteristics, the Jazz Bass is often preferred by bass players who seek a more noticeable sound, rather than serving as a background instrument. The sound of the Jazz Bass has been fundamental in the development of signature sounds in certain musical genres, such as funk, disco, reggae, blues, progressive rock, heavy metal and jazz fusion.