Guitar is a musical instrument with ancient roots, used in a wide variety of musical styles, and it is also a solo classical instrument. It is most recognized as the primary instrument in blues, country, flamenco, rock music and many forms of pop. The guitar usually has six strings, but four-, seven-, eight-, ten-, and Twelve string guitars also exist. Guitars are made and repaired by luthiers. Guitars may be played acoustically or they may rely on an amplifier that usually allows for electronic manipulation of tone. The electric guitar was introduced in the 20th century, and had a profound influence on popular culture. Instruments similar to the guitar have been popular for at least 5,000 years. The guitar appears to be derived from earlier instruments known in ancient central Asia as the Sitara. Instruments very similar to the guitar appear in ancient carvings and statues recovered from the old Iranian capitol of Susa. The modern word, guitar, was adopted into English from Spanish guitarra, derived from earlier Greek word kithara. Prospective sources for various names of musical instruments that guitar could be derived from appear to be a combination of two Indo-European roots: guit-, similar to Sanskrit sangeet meaning "music", and -tar a widely attested root meaning "chord" or "string". The word of guitar is a Persian loanword to Iberian Arabic. The word qitara is an Arabic name for various members of the lute family that preceded the Western guitar. The name guitarra was introduced into Spanish when such instruments were brought into Iberia by the Moors after the 10th century.