You improvise songs on the harp like David and invent your own musical instruments.
Berean Standard Bible (BSB)
who strum on the strings of a harp; who invent for themselves instruments of music, like David;
World English Bible (WEB)
That chant{H6527}{(H8802)} to the sound{H6310} of the viol{H5035}, and invent{H2803}{(H8804)} to themselves instruments{H3627} of musick{H7892}, like David{H1732};
Strong's King James
Who drone on to the sound of a harp, [Imagining] they are David, inventing musical instruments for their songs.
The F.O.G
The F.O.G Message
Who are taking part according to the psaltery, Like David they invented for themselves instruments of music;
Young's Literal Translation