Heptachord, from Greek ', from ancient greek á¼ÂÃÂÃÂìÃÂÿÃÂôÿà(heptákhordos, "seven-stringed"), from á¼ÂÃÂÃÂì (heptá, "seven") + ÃÂÿÃÂôî (khordá¸Â, "chord"), is a 7-stringed lyre of ancient Greece, the interval of a seventh, or a (diatonic) scale of seven notes or tones.
Most of the ancient greek lyres had 7 strings. Early lyres originate in ancient Mesopotamia.
Two intervals are possible:
A heptachord is based on two consecutive tetrachords.
1ý1, ý11, 11ý
and the tritone<br> 111
The 7 modal patterns for the Babylonian heptachords are:
A tuning procedure âÂÂlooseningâ (TU.LU) in Music of Mesopotamia for a 7-stringed instrument based on a transposition to D/D:
âÂÂtighteningâ (GÃÂD.I)
ý1ý
ý1ý1ý1 and 1ý1ý1ý