Accompaniment is the musical parts which provide the rhythmic and/or harmonic support for the melody or main themes of a song or instrumental piece. There are many different styles and types of accompaniment in different genres and styles of music. In homophonic music, the main accompaniment approach used in popular music, a clear vocal melody is supported by subordinate chords. In popular music and traditional music, the accompaniment parts typically provide the "beat" for the music and outline the chord progression of the song or instrumental piece. The accompaniment for a vocal melody or instrumental solo can be played by a single musician playing an instrument such as piano, pipe organ, or guitar. While any instrument can in theory be used as an accompaniment instrument, keyboard and guitar-family instruments tend to be used if there is only a single instrument, as these instruments can play chords and basslines simultaneously (chords and a bassline are easier to play simultaneously on keyboard instruments, but a fingerpicking guitarist can play chords and a bassline simultaneously on guitar). A solo singer can accompany herself by playing guitar or piano while she sings, and in some rare cases, a solo singer can even accompany himself or herself just using his or her voice and body (e.g., Bobby McFerrin). Alternatively, the accompaniment to a vocal melody or instrumental solo can be provided by a musical ensemble, ranging in size from a duo (e.g., cello and piano; guitar and double bass; synthesizer and percussion); a trio (e.g., a rock power trio of electric guitar, electric bass and drum kit; an organ trio); a quartet (e.g., a string quartet in Classical music can accompany a solo singer; a rock band or rhythm section in rock and pop; a jazz quartet in jazz); all the way to larger ensembles, such as concert bands, Big Bands (in jazz), pit orchestras in musical theatre; and orchestras, which, in addition to playing symphonies, can also provide accompaniment to a concerto solo instrumentalist or to solo singers in opera. With choral music, the accompaniment to a vocal solo can be provided by other singers in the choir, who sing harmony parts or countermelodies. Accompaniment parts range from so simple that a beginner can play them (e.g., simple three-note triad chords in a traditional folk song) to so complex that only an advanced player or singer can perform them (e.g., the piano parts in Schubert's Lieder art songs from the 19th century or vocal parts from a Renaissance music motet). The accompaniment instrumentalists and/or singers can be provided with a fully notated accompaniment part written or printed on sheet music. This is the norm in Classical music and in most large ensemble writing (e.g., orchestra, pit orchestra, choir). In popular music and traditional music, the accompaniment instrumentalists often improvise their accompaniment, either based on a lead sheet or chord chart which indicates the chords used in the song or piece (e.g., C Major, d minor, G7, or Nashville numbers or Roman numerals, such as I, ii, V7, etc.) or by "playing by ear". Chord-playing musicians (e.g., those playing guitar, piano, Hammond organ, etc.) can improvise chords, "fill-in" melodic lines and solos from the chord chart. It is rare for chords to be fully written out in music notation in pop and traditional music. Some guitarists, bassists and other stringed instrumentalists read accompaniment parts using tabulature (or "tab"), a notation system which shows the musician where on the instrument to play the notes. Drummers can play accompaniment by following the lead sheet, a sheet music part in music notation, or by playing by ear. In pop and traditional music, bass players, which may be upright bass or electric bass, or another instrument, such as bass synth, depending on the style of music, are usually expected to be able to improvise a bassline from a chord chart or learn the song from a recording. In some cases, an arranger or composer may give a bassist a bass part that is fully written out in music notation.
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