עֲֽלֵי־עָ֭שׂוֹר וַעֲלֵי־נָ֑בֶל עֲלֵ֖י הִגָּי֣וֹן בְּכִנּֽוֹר׃
With an instrument of ten strings, and with the psaltery; With a solemn sound upon the harp.
Rashi on Psalms
Upon a ten-stringed harp and upon a psaltery Heb. עשור, a harp of ten strings.