שמואל א יח:כד פירוש: רש״י

And cymbals. Targum Yonoson renders, 'and with cymbals,' a type of musical instrument.¹Perhaps a three [=שָׁלשׁ] stringed harp.—Radak.

He is lacking. What more is he lacking, that he needs to acquire?

Only the kingship. He needs nothing else but the kingship.