Vide Titles to Pss. vi. and xii. in A.V. “upon Sheminith,” marg. “the eighth.”  LXX ὑπὲρ τῆς ὀγδόης.  Vulg. pro octava.  On various explanations of the Hebrew word vide Dict Bib. S. V. where Dr. Aldis Wright inclines to the view that it is a tune or key, and that the Hebrews were not acquainted with the octave.