The number of frets installed on a bass guitar neck may vary. The original Fender basses had 20 frets, and most bass guitars have between 20 and 24 frets or fret positions. Instruments with between 24 and 36 frets (2 and 3 octaves) also exist. Instruments with more frets are used by bassists who play bass solos, as more frets gives them additional upper range notes. When a bass has a large number of frets, such as a 36 fret instrument, the bass may have a deeper "cutaway" to enable the performer to reach the higher pitches. Like electric guitars, fretted basses typically have markers on the fingerboard and on the side of the neck to assist the player in determining where notes and important harmonic points are. The markers indicate the 3rd, 5th, 7th, 9th fret and 12th fret (the 12th fret being the octave of the open string) and on the octave-up equivalents of the 3rd fret and as many additional positions as an instrument has frets for. Typically, one marker is on the 3rd, 5th, 7th and 9th fret positions and two markers on the 12th fret.
Drums with cylindrical shells can be open at one end (as is the case with timbales), or can have two drum heads, one head on each end. Single-headed drums typically consist of a skin stretched over an enclosed space, or over one of the ends of a hollow vessel. Drums with two heads covering both ends of a cylindrical shell often have a small hole somewhat halfway between the two heads; the shell forms a resonating chamber for the resulting sound. Exceptions include the African slit drum, also known as a log drum as it is made from a hollowed-out tree trunk, and the Caribbean steel drum, made from a metal barrel. Drums with two heads can also have a set of wires, called snares, held across the bottom head, top head, or both heads, hence the name snare drum. On some drums with two heads, a hole or bass reflex port may be cut or installed onto one head, as with some 2010s era bass drums in rock music.
Once upon a time, the only piano you could buy was a large and ridiculously expensive acoustic grand piano. Thanks to advances in flash memory, sampling, and other digital technology, we now have more compact and affordable options known as digital pianos. As time goes on, these digital options continue to get closer to genuine acoustic pianos in terms of sound and feel. In fact, many traditional piano brands have sampled their most famous grand pianos to make the signature tone available in portable digital models. The keyboards on digital pianos are designed with special weighted actions and textured finishes to simulate the ebony and ivory keys on acoustic instruments.
All of these are classified as non-pitched percussion, allowing for the music to be scored using percussion notation, for which a loose semi-standardized form exists for both the drum kit and electronic drums. The drum kit is usually played while seated on a stool known as a throne. While many instruments like the guitar or piano are capable of performing melodies and chords, most drum kits are unable to achieve this as they produce sounds of indeterminate pitch. The drum kit is a part of the standard rhythm section, used in many types of popular and traditional music styles, ranging from rock and pop to blues and jazz. Other standard instruments used in the rhythm section include the piano, electric guitar, electric bass, and keyboards.
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.
Other design options include finishes, such as lacquer, wax and oil; flat and carved designs; luthier-produced custom-designed instruments; headless basses, which have tuning machines in the bridge of the instrument (e.g., Steinberger and Hohner designs) and several artificial materials such as luthite. The use of artificial materials (e.g., BassLab) allows for unique production techniques such as die-casting, to produce complex body shapes. While most basses have solid bodies, they can also include hollow chambers to increase the resonance or reduce the weight of the instrument. Some basses are built with entirely hollow bodies, which change the tone and resonance of the instrument. Acoustic bass guitars have a hollow wooden body constructed similarly to an acoustic guitar, and are typically equipped with piezoelectric or magnetic pickups and amplified.