Some cymbals may be considered effects in some kits but "basic" in another set of components. A swish cymbal may, for example serve, as the main ride in some styles of music, but in a larger kit, which includes a conventional ride cymbal as well, it may well be considered an effects cymbal per se. Likewise, Ozone crashes have the same purpose as a standard crash cymbal, but are considered to be effects cymbals due to their rarity, and the holes cut into them, which provide a darker, more resonant attack.
The digital piano is a specific kind of electronic keyboard that acts as a compact and lightweight alternative to a standard piano. Today's digital pianos feature hammer action keys (88-key being the norm) to emulate the sound and playability of their acoustic counterparts very accurately; some models can even replicate the sound of a pipe organ, Hammond organ and harpsichord. They have many other advantages as well: digital pianos are more affordable, their volume can be controlled and they never have to be tuned. Most digital pianos even have a headphone option for musicians who live in apartments where volume might be an issue. Because of these many benefits, digital pianos are often preferred over acoustic pianos by music educators and their pupils - this includes for amateur performances and school recitals.
In the 1930s, musician and inventor Paul Tutmarc of Seattle, Washington, developed the first electric string bass in its modern form, a fretted instrument designed to be played horizontally. The 1935 sales catalog for Tutmarc's electronic musical instrument company, Audiovox, featured his "Model 736 Bass Fiddle", a four-stringed, solid-bodied, fretted electric bass instrument with a 30 1⁄2-inch (775-millimetre) scale length. The adoption of a guitar's body shape made the instrument easier to hold and transport than any of the existing stringed bass instruments. The addition of frets enabled bassists to play in tune more easily than on fretless acoustic or electric upright basses. Around 100 of these instruments were made during this period.
In the jazz scene, since the bass guitar takes on much of the same role as the double bass—laying down the rhythm, and outlining the harmonic foundation—electric bass players have long used both bass guitar methods and jazz double bass method books. The use of jazz double bass method books by electric bass players in jazz is facilitated in that jazz methods tend to emphasize improvisation techniques (e.g., how to improvise walking basslines) and rhythmic exercises rather than specific ways of holding or plucking the instrument.