In the 1930s, inventor Paul Tutmarc from Seattle, Washington, developed a guitar-style electric bass instrument that was fretted and designed to be held and played horizontally. Audiovox's sales catalogue of 1935-6 (also featuring a solid body six-string electric guitar) listed the world’s first fretted, solid body electric bass that was designed to be played horizontally — the Model #736 Electronic Bass Fiddle (German text). The change to a "guitar" form made the instrument easier to hold and transport, and the addition of guitar-style frets enabled bassists to play in tune more easily and made the new electric bass easier to learn. Tutmarc's inventions never caught the public imagination and almost no further development of the instrument took place until the 1950s.
1950s-1960s:
In the 1950s, Leo Fender developed the first mass-produced electric bass. His Fender Precision Bass, introduced in 1951, became a widely copied industry standard. The Precision Bass (or "P-bass") evolved from a simple, uncontoured 'slab' body design similar to that of a Telecaster with a single piece, four-pole pickup to a contoured body design with beveled edges for comfort and a single "split coil pickup."
First introduced in 1960, The Jazz Bass was known as the Deluxe Bass and was meant to accompany the Jazzmaster guitar. The Jazz Bass (often referred to as a "J-bass") featured two single-coil pickups, one close to the bridge and one in the Precision bass' position. The earliest production basses had a 'stacked' volume and tone control for each pickup. This was soon changed to the familiar configuration of a volume control for each pickup, and a single, passive tone control. The Jazz Bass' neck was narrower at the nut than the Precision bass (1 1/2" vs 1 3/4").
Another visual difference that set the Jazz Bass apart from the Precision is its "offset-waist" body. Pickup positions on other manufacturers' basses are often referred to as "P" or "J" position pickups, in reference to Precision and Jazz basses. Fender also began production of the Mustang Bass; a 30" scale length instrument used by bassists such as Tina Weymouth of Talking Heads ("P" and "J" basses have a scale length of 34").
In the 1950s and 1960s, the term "Fender bass" was widely used to describe the bass guitar, due to Fender's early dominance in the market for mass-produced bass guitars. The term "electric bass" began replacing "Fender bass" in the late 1960s, however, as evidenced by the title of Carol Kaye's popular bass instructional book in 1969 (How to Play the Electric Bass) and the use of the term "electric bass" by U.S. musicians' unions. The instrument is also referred to as an "electric bass guitar," "electronic bass," or simply "bass."(IPA: [beɪs]) pronounced same as "base").
1960s and 1970s
Following Fender's lead, Gibson released the violin-shaped EB-1 Bass in 1953[3], followed by the more conventional-looking EB-0 Bass in 1959. As with Fender's designs, Gibson relied heavily upon an existing guitar design for this bass; the EB-0 was very similar to a Gibson SG in appearance (although the earliest examples have a slab-sided body shape closer to that of the double-cutaway Les Paul Special).
Whereas Fender basses had pickups mounted in positions in between the base of the neck and the top of the bridge, many of Gibson's early basses featured one humbucking pickup mounted directly against the neck pocket. The EB-3, introduced in 1961, also had a "mini-humbucker" at the bridge position. Gibson basses also tended to be smaller, sleeker instruments; Gibson did not produce a 34" scale bass until 1963 with the release of the Thunderbird, which was also the first Gibson bass to utilize dual-humbucking pickups in a more traditional position, about halfway between the neck and bridge.

With the explosion of the popularity of rock music in the 1960s, Rickenbacker, Danelectro and many other companies started to produce their own version of the electric bass. The 1970s also saw the founding of Music Man Instruments, owned by Leo Fender, which produced the StingRay, the first widely-produced bass with active (powered) electronics. Specific models became identified with particular styles of music, such as the Rickenbacker 4000 series, which became identified with progressive rock bassists like Chris Squire of Yes.
In 1971 Alembic established the template for what would subsequently be known as "boutique" or "high end" electric basses. These expensive, custom-tailored instruments featured unique designs, premium wood bodies chosen and hand-finished by master craftspeople, onboard electronics for preamplification and equalization, and innovative construction techniques such as multi-laminate neck-through-body construction and graphite necks. In the mid-1970s, Alembic and other "boutique" bass manufacturers such as Tobias, and Ken Smith produced 4- string basses and 5-string basses with a low "B" string. In 1975, bassist Anthony Jackson commissioned luthier Carl Thompson to a 6-string bass tuned (low to high) B, E, A, D, G, C.
1980s-2000s
In the 1980s, bass designers continued to explore new approaches. Ned Steinberger introduced a headless bass in 1979 and continued his innovations in the 1980s, using graphite and other new materials and (in 1984) introducing the Trans-Trem tremolo bar. In 1987, the Guild Guitar Corporation launched the fretless Ashbory bass, which used silicone rubber strings and a piezoelectric pickup to achieve a "double bass" sound with a short 18" scale length. In the late 1980s, MTV's "unplugged" show helped to popularize hollow-bodied acoustic bass guitars amplified with pickups.
During the 1990s, as five-string basses became more widely available and more affordable, an increasing number of bassists in genres ranging from metal to gospel began using five-string instruments for added lower range. As well, the onboard battery-powered electronics such as preamplifiers and equalizer circuits, which were previously only available on expensive "boutique" instruments, became increasingly available on modestly-priced basses.
In the 2000s, some bass manufacturers included digital modelling circuits inside the instrument to recreate tones and sounds from many models of basses (e.g., Line 6's Variax bass). Traditional bass designs such as the Fender Precision Bass and Fender Jazz Bass remained popular in the 2000s; in 2006, a 60th Anniversary P-bass was introduced by Fender.