A bassline (also known as a bass line or bass part) is the term used in many styles of popular music, such as jazz, blues, funk, dub and electronic music for the low-pitched instrumental part or line played by a rhythm section instrument such as the electric bass, double bass, tuba or keyboard (piano, Hammond organ, electric organ, or synthesizer). It is also used sometimes in classical music. In solo performance basslines may simply be played in the lower register of any instrument such as guitar while melody and/or further accompaniment is provided in the middle or upper register. Basslines in popular music often use "riffs" or "grooves", which are usually simple, appealing musical motifs or phrases that are repeated, with variation, throughout the song. "The bass differs from other voices because of the particular role it plays in supporting and defining harmonic motion. It does so at levels ranging from immediate, chord-by-chord events to the larger harmonic organization of a entire work." Bassline riffs usually emphasize the chord tones of each chord (usually the root note, the third note, the fifth note, and the octave of a chord), which helps to define a song's key. At the same time, basslines work along with the drum part and the other rhythm instruments to create a clear rhythmic pulse.
The type of rhythmic pulse used in basslines varies widely in different types of music. In swing jazz and jump blues, basslines are often created from a continuous sequence of quarter notes in a mostly scalar, stepwise part called a "walking bass line." In latin, salsa music, jazz fusion, reggae, electronica, and some types of rock and metal, basslines may be very rhythmically complex and syncopated. In bluegrass and traditional country music, basslines often emphasize the root and fifth of each chord. Though basslines may be played by many different types of instruments and in a broad musical range they are generally played on bass instruments and in the range roughly at least an octave and a half below middle C. In classical music such as string quartets and symphonies, basslines play the same harmonic and rhythmic role; however, they are usually referred to as the "bass voice" or the "bass part."
Most popular musical ensembles include an instrument capable of playing bass notes. In the 1920s, a tuba was often used. In the 1930s and 1940s, most popular music groups used the double bass as the bass instrument. Starting in the 1960s, the louder, easier-to-transport bass guitar replaced the double bass in most types of popular music, such as rock and roll, blues, and folk. By the 1970s and 1980s, the electric bass was used in most rock bands and jazz fusion groups. The double bass was still used in some types of popular music that recreated styles from the 1940s and 1950s such as jazz (especially swing and bebop), traditional 1950s blues, jump blues, country, and rockabilly.
In some popular music bands, keyboard instruments are used to play the bass line. In organ trios, for example, a Hammond organ player performs the basslines using the organ's pedal keyboard. In some types of popular music, such as hip-hop or house music, the bass lines are played using synthesizers, sequencers, or electro-acoustically modeled samples of bass lines. In electronic music and house music, bass lines are often performed on electronic devices such as the Roland TB-303.
In modern popular music, the bassline is generally played by an electric bass guitar player. The bassline bridges the gap between the rhythm part played by the drummer and the melodic and harmonic lines played by the lead and rhythm guitarists. Bass players also perform fills in between the phrases of the vocal melody, and they may also perform bass runs or bass breaks, which are short solo sections. Rhythmic variations by the bass, such as the introduction of a syncopated figure can dramatically change the feel of a song, even for a simple groove.
"In any style, the bass's role in the groove is the same: to keep time and to outline the tonality. When developing bass lines, these two things should always be your goal"
A walking bass is a style of bass accompaniment or line, common in baroque music and jazz, which creates a feeling of regular quarter note movement, akin to the regular alteration of feet while walking. Thus walking basslines generally consisting of unsyncopated notes of equal value, usually quarter notes (known in jazz as a "four feel"). Walking basslines use a mixture of scale tones, arpeggios, chromatic runs, and passing tones to outline the chord progression of a song or tune, often with a melodic shape that alternately rises and falls in pitch over several bars. To add variety to a walking bassline, bassists periodically interpolate various fills, such as playing scale or arpeggio fragments in swung eighth notes, plucking muted percussive grace notes (either one grace note or a "raked" sequence of two or three grace notes), or holding notes for two, three, or four beats. Some songs lend themselves to another type of variation: the pedal point, in which the bassist holds or repeats a single note (often the tonic or the dominant) under the chord changes.
Walking basslines are usually performed on the double bass or the electric bass, but they can also be performed using the low register of a piano, Hammond organ, tuba or other instruments. They can also be sung. While walking bass lines are most commonly associated with jazz and blues, they are also used in rock, rockabilly, ska, R&B, gospel, latin, country, and many other genres.
Walking bass in the pedal part of baroque organ music (J.S. Bach's Nun komm' der heiden Heiland, BWV 659, from the Great Eighteen Chorale Preludes):
Walking bass often alternates quarter notes:
giving rise to the term.
Many boogie-woogie basslines are walking bass lines:
Walking bass often moves in stepwise (scalar) motion to successive chord roots, such as often in country music:
In this example, the last two quarter notes of the second measure, D and E, "walk" up from the first quarter note in that measure, C, to the first note of the third measure, F (C and F are the roots of the chords in the first through second and third through fourth measures, respectively).
In both cases, "walking" refers both to the steady duple rhythm (one step after the other) and to the strong directional motion created; in the examples above, from C to F and back in the second, and from root to seventh and back in the first.
A bass run (or "bass break") is a short instrumental break or fill in which the bass instrument, such as an electric bass or a double bass (or instruments, in the case of a marching band) and the bassline are given the forefront. The bass part for a bass run often differs from the usual bass accompaniment style, in terms of the register, timbre, or melodic style that is used, or the number of notes per beat which are played.
A bass run may be composed by the performer or by an arranger prior to a performance, or it may be improvised onstage by the performer using scales, arpeggios, and standard licks and riffs. In some cases, a bass run may incorporate a display of virtuoso techniques such as rapid passages or high notes. During a bass run, the main vocal or melody line usually stops, and in some cases, the percussion or drums may also stop. The technique originated in the marches of the "Sousa school", though its resemblance to call and response techniques familiar to African American musicians indicates an earlier origin.
In a rock song in which the bassline consists of low-pitched quarter notes played on the electric bass, a bass run may consist of a rapid sequence of sixteenth notes in a higher register, or of a melodic riff played in a higher register. In some cases, the bassist will select a "brighter"-sounding pickup or increase the treble response of the instrument for a bass run, so that it will be easier to hear.
In a pop song in which the bassline consists of notes plucked on the electric bass, a bass run may consist of several bars of percussive slapping and popping.
In a funk song in which the bassline already consists of percussive slapping and popping, a bass run may consist of a virtuostic display of rapid slapping and popping techniques combined with techniques such as glissando, note-bending, and harmonics.
In a jump blues tune in which the bassline consists of low-pitched quarter notes played on the double bass in a scalar walking bass style, a bass run may consist of a bar of swung eighth notes played using a percussive slap bass style, in which the right hand strikes the strings against the fingerboard.
In a swing tune in which the bassline consists of low-pitched quarter notes played on the double bass in a scalar walking bass style, a bass run may consist of a descending chromatic scale played in a higher register.
In a bluegrass tune in which the bassline consists of low-pitched quarter notes played on the double bass on the root and fifth of each chord on beats one and three (of a 4/4 tune), a bass run may consist of a walking bass line played for several bars.
In a marching band context, a bass run may consist of a several bar unaccompanied passage composed for the tubas and sousaphones which displays either rapid passages of notes or higher-register techniques. In New orleans jazz, the tuba may provide a walking bass line similar to that of the double bass.
- Buelow, George J. (2004), A history of baroque music, Indiana University Press, p. 40, ISBN 0-253-34365-8
- Friedland, Ed (1995), Building Walking Bass Lines, ISBN 0-7935-4204-9
- van der Merwe, Peter (1989), Origins of the Popular Style: The Antecedents of Twentieth-Century Popular Music, Oxford University Press, ISBN 0-19-316121-4
- Cadwallader, Allen (1998), Analysis of Tonal Music: A Schenkerian Approach, p. 45, ISBN 0-19-510232-0
- Santerre, Joe (2001), Slap Bass Lines, ISBN 0-634-02144-3
- PDF (41.4 KB) - 244 million bass lines in F
- http://www.youtube.com/watch?v=sttpeVdSYTs  An audio/video example of a walking bass line played on electric bass guitar, created specifically to accompany this Wikipedia entry (GFDL/Creative Commons) by Dave Muscato, session bassist, for information purposes only.
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