Who strum on the strings of a harp; Who invent for themselves instruments of music, like David;
Note also that it is not the "invention" of musical instruments which is primarily in focus here, that having no element of sin in any way connected with it; but it is the sin of "inventing for or unto themselves," a clear echo of "Thou shalt not make unto thee a graven image"  (Exodus 20:4), the thing forbidden there not being merely the making of any kind of image, but the making "unto themselves" of graven images, the making of religious images!  The similarity of the language here shows that the innovative nobles of Samaria had further corrupted their own perverted worship at Bethel by following the sinful example set by David in his introduction of the musical instruments into God's worship in Jerusalem. There is no good reason for setting aside this obvious meaning of the passage.  Some astute scholars have discerned this and, accordingly, have invoked their rule of last resort, screaming "Interpolation,"[21] when there's no other way to support the popular prejudice that freely allows the use of mechanical instruments in the worship of the Author of Christianity.