The electric bass is a relative newcomer to the world of jazz. The big bands of the 1930s and 1940s Swing era and the small combos of the 1950s Bebop and Hard Bop movements all used the double bass. The electric bass was introduced in some bands in the 1950s and it became prominent during the late 1960s and early 1970s, when rock influences were blended with jazz to create jazz-rock fusion.
Specific bass brands/models became identified with particular styles of music, such as the Rickenbacker 4001 series, which became identified with progressive rock bassists like Chris Squire of Yes, and Geddy Lee of Rush, while the StingRay was used by funk/disco players such Louis Johnson of the funk band The Brothers Johnson and Bernard Edwards of Chic. The 4001 stereo bass was introduced in the late 1960s; it can be heard on the Beatles' "I Am The Walrus." 
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If the toms are omitted completely, or the bass drum is replaced by a pedal-operated beater on the bottom skin of a floor tom and the hanging toms omitted, the result is a two-piece "cocktail" (lounge) kit. Such kits are particularly favoured in musical genres such as trad jazz, rockabilly and jump blues. Some rockabilly kits and beginners kits for very young players omit the hi-hat stand. In rockabilly, this allows the drummer to play standing rather than seated.
Dual coil "humbucker" pickups, sometimes abbreviated to DC pickups, have two signal-producing coils that are reverse-wound around opposed polarity magnets (similar in principle to the two individual J-pickups or the two halves of a modern Precision pickup, only in a single housing). This significantly reduces unwanted noise from electromagnetic interference compared to single coil pickups. Humbuckers also often produce a higher output level than single coil pickups, though many dual-coil pickups are marketed as retrofits for single-coil designs like the J pickup and advertise a similar output and tonal character to the stock single-coils. Dual coil pickups come in two main varieties; ceramic or ceramic and steel. Ceramic-only magnets have a relatively "harsher" sound than their ceramic and steel counterparts, and are thus used more commonly in heavier rock styles (heavy metal music, hardcore punk, etc.).
Snare drum and tom-tom Typical ways to muffle a snare or tom include placing an object on the outer edge of the drumhead. A piece of cloth, a wallet, gel, or fitted rings made of mylar are common objects. Also used are external clip-on muffles that work using the same principle. Internal mufflers that lie on the inside of the drumhead are often built into a drum, but are generally considered less effective than external muffles, as they stifle the initial tone, rather than simply reducing the sustain of it.