1 Chronicles 15:21 - Joseph Benson’s Commentary on the Old and New Testaments

With harps on Sheminith Some think Sheminith signifies a harp with eight strings. But perhaps, as was said of Alamoth, it might be the name of a tune, or note, or part in music. Or it might be the beginning of some psalm much used. Its signification is very doubtful, nor is it necessary to know it. To excel The original word לנצח, lenatzeach, being derived from נצח, natzach, to overcome, is thought by Strigelius to signify an extension or elevation of the voice above all the rest.