A guitar solo is a melodic passage, instrumental section, or entire piece of music, pre-written (or improvised) to be played on a classical, electric, or acoustic guitar. In 20th and 21st century traditional music and popular music such as blues, swing, jazz, jazz fusion, rock and heavy metal, guitar solos often contain virtuoso techniques and varying degrees of improvisation. Guitar solos on classical guitar, which are typically written in musical notation, are also used in classical music forms such as chamber music and concertos. Guitar solos range from unaccompanied works for a single guitar to compositions with accompaniment from a few other instruments or a large ensemble. The accompaniment musicians for a guitar solo can range from a small ensemble such as a jazz quartet or a rock band, to a large ensemble such as an orchestra or big band. Unaccompanied acoustic guitar music is found in folk and classical music dating as far back as the instrument's first use in western music, the use of an acoustic guitar as a solo voice within an ensemble dates back at least to the Baroque concerto. The classical guitar is an acoustical wooden guitar with six strings, usually nylon, as opposed to the metal strings used in metal stringed acoustic guitars used in other genres. Classical guitar is typically played by plucking individual strings with the fingernails or the fingertips. A classical guitar solo concert is typically called a recital; it may include a variety of works, e.g. works written originally for the lute or vihuela by composers such as John Dowland (b. Ireland 1563) and Luis de Narváez (b. Spain c. 1500), and also music written for the harpsichord by Domenico Scarlatti (b. Italy 1685), for the baroque lute by Sylvius Leopold Weiss (b. Germany 1687), for the baroque guitar by Robert de Visée (b. France c. 1650) or even Spanish-inspired music written for the piano by Isaac Albéniz (b. Spain 1860) and Enrique Granados (b. Spain 1867). Johann Sebastian Bach (b.
Martin Alois Rohrmeier, Johannes Hentschel, Gabriele Cecchetti, Sabrina Laneve, Ludovica Schaerf