Albert Barnes Commentary 1 Chronicles 15:20

"and Zechariah, and Aziel, and Shemiramoth, and Jehiel, and Unni, and Eliab, and Maaseiah, and Benaiah, with psalteries set to Alamoth;" — 1 Chronicles 15:20 (ASV)

Psalteries on Alamoth - This likely refers to psalteries whose tone resembled the voices of girls (עלמות ‛ălâmôth). Compare this to the “female flutes” of the Lydians.