Terpander (tûrpăn´dər), fl. c.675 BC, musician of Lesbos, one of the earliest founders of Greek classical music. Upon somewhat doubtful evidence, Terpander is credited with having completed the octave and adding the sixth and seventh strings to the kithara. He was also known as a poet, teacher, and composer.
"Terpander." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (January 16, 2019). https://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/terpander
"Terpander." The Columbia Encyclopedia, 6th ed.. . Retrieved January 16, 2019 from Encyclopedia.com: https://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/terpander