Answer: psalteries

AnswerCrossword Clue
PSALTERIESAncient instruments.
PSALTERIESExtra note that is included in changes for old string instruments (10)
psalteriesPSALTERY, an ancient stringed musical instrument, also PSALTRY
psalteriesAn ancient and medieval musical instrument like a dulcimer but played by plucking the strings with the fingers or a plectrum