The kithara (or Latinized cithara) (Greek: κιθάρα, romanized: kithāra, Latin: cithara) was an ancient Greek musical instrument in the yoke lutes family. In modern Greek the word kithara has come to mean "guitar", a word which etymologically stems from kithara.
The kithara was a seven-stringed professional version of the lyre, which was regarded as a rustic, or folk instrument, appropriate for teaching music to beginners. As opposed to the simpler lyre, the kithara was primarily used by professional musicians, called kitharodes. The kithara's origins are likely Anatolian.: 185  popular in the eastern Aegean and ancient Anatolia.
The kithara was played primarily to accompany dance, epic recitations, rhapsodies, odes, and lyric songs. It was also played solo at the receptions, banquets, national games, and trials of skill. Aristotle said that these string instruments were not for educational purposes but for pleasure only.
It was played by strumming the strings with a stiff plectrum made of dried leather, held in the right hand with elbow outstretched and palm bent inwards. The strings with undesired notes were damped with the straightened fingers of the left hand.
The kithara had a deep, wooden sounding box composed of two resonating tables, either flat or slightly arched, connected by ribs or sides of equal width. At the top, its strings were knotted around the crossbar or yoke (zugon) or to rings threaded over the bar, or wound around pegs. The other ends of the strings were secured to a tail-piece after passing over a flat bridge, or the tail-piece and bridge were combined.
Most vase paintings show kitharas with seven strings, in agreement with ancient authors, but those same authors also mention that occasionally an especially skillful kitharode would use more than the conventional seven strings.
The cithara is said to have been the invention of Apollo, the god of music. Apollo is often depicted playing a cithara instead of a lyre, often dressed in a kitharode’s formal robes. Kitharoidos, or Citharoedus is an epithet given to Apollo, which means "lyre-singer" or "one who sings to the lyre".
An Apollo Citharoedus or Apollo Citharede, is the term for a type of statue or other image of Apollo with a cithara. Among the best-known examples is the Apollo Citharoedus at the Vatican Museums, a 2nd century CE colossal marble statue by an unknown Roman sculptor.
Sappho is closely associated with music, especially string instruments like the kithara and the barbitos. She was a woman of high social standing and composed widely popular songs that focused on the emotions.
A story from Greek myth goes that she ascended the steep slopes of Mount Parnassus where she was welcomed by the Muses. She wandered through the laurel grove and came upon the cave of Apollo, where she bathed in the Castalian Spring and took Phoebus' (Apollo's) plectrum to play skillful music. The sacred nymphs danced while she stroked the strings with much talent to bring forth sweet musical melodies from the resonant kithara.
In the Middle Ages, cythara was also used generically for stringed instruments including lyres, but also including lute-like instruments.[a][b] The use of the name throughout the Middle Ages looked back to the original Greek kithara, and its abilities to sway people's emotions.
The cithara is mentioned a number of times in the Bible, but generally mistranslated into English as "harp" or "psaltery". Psalm 42 in the Latin Vulgate (Psalm 43 in other versions), says, "Confitebor tibi in cithara, Deus, Deus meus," which is translated in the Douay-Rheims version as "To thee, O God my God, I will give praise upon the harp." The King James version renders this verse as "Yea, upon the harp will I praise thee, O God my God." The cithara is also mentioned in other places in the Latin Vulgate version of the Bible, including Genesis 4:21, 1 Kings (1 Samuel) 16:16, 1 Paralipomenon (1 Chronicles) 25:3, Job 30:31, Psalms 32:2, Psalms 56:9, Psalms 70:22, Psalms 80:3, Psalms 91:4, Psalms 97:5, Psalms 107:3, Psalms 146:7, Psalms 150:3, Isaiah 5:12, Isaiah 16:11, 1 Machabees 3:45, and 1 Corinthians 14:7.
Aristotle calls the kithara an organon technikon
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