Charles H. Spurgeon on Psalms 150:4

Stringed instruments. Minnim (which is derived from a root signifying "division", or" distribution", hence strings) occurs in Ps 45:8, and Ps 150:4, and is supposed by some to denote a stringed instrument, but it seems merely a poetical allusion to the strings of any instrument. Thus, in Ps 45:8, we would read, "Out of the ivory palaces the strings (i.e. concerts of music) have made thee glad"; and so in Ps 150:4, "Praise him with strings (stringed instruments), and ugabs." —John Kitto.